diff --git a/tools/android/exercise-final-progression.ps1 b/tools/android/exercise-final-progression.ps1
index e764df8..f0d6c4a 100644
--- a/tools/android/exercise-final-progression.ps1
+++ b/tools/android/exercise-final-progression.ps1
@@ -30,7 +30,7 @@ function RevealBall([int]$Stage,[string]$Id,[string]$Name) {
     for($view=0;$view-lt12;$view++){
         $board=Board (Save "$Name-view-$view") $Stage
         if(BallClear $board $Id){return $board}
-        Orbit "$Name-orbit-$view" $board
+        Orbit "$Name-orbit-$view" $board -Pitch:($view%4-eq3)
     }
     throw "No safe first-hit view for actual ball $Id within a full native orbit."
 }
@@ -46,17 +46,24 @@ function MergeReal([int]$Stage,[string]$Name,[int]$SourceCount=0,[int]$TargetCou
             [pscustomobject]@{sid=$sid;tid=$tid;depth=[Math]::Abs($delta.Z);size=$source.ballIds.Count}
         }}}}) | Sort-Object depth,size
         $pair=$null
-        foreach($candidate in $pairs){if($candidate.depth-lt.9-and(BallClear $board $candidate.sid)){$pair=$candidate;break}}
+        $offset=if($attempt%2-eq0){-35}else{35}
+        foreach($candidate in $pairs){
+            if($candidate.depth-ge.9-or!(BallClear $board $candidate.sid)){continue}
+            $targetPoint=BallPoint $board $candidate.tid
+            if(WorldSafe @(($targetPoint[0]+$offset),$targetPoint[1])){$pair=$candidate;break}
+        }
         if($pair) {
-            $start=BallPoint $board $pair.sid; $end=BallPoint $board $pair.tid
+            $end=BallPoint $board $pair.tid
             # Try a short lateral contact offset, then orbit to expose another depth plane if blocked.
-            $offset=if($attempt%2-eq0){-35}else{35}
-            Step "$Name-drag-$attempt" @('shell','input','swipe',"$($start[0])","$($start[1])","$($end[0]+$offset)","$($end[1])",'500')
-            $after=Save "$Name-after-$attempt"; $newBoard=Board $after $Stage
-            if($null-eq$newBoard-or$newBoard.groups.Count-lt$oldCount){return $after}
+            $after=NativeMoveAndHold "$Name-drag-$attempt" $board $pair.sid @(($end[0]+$offset),$end[1]);$newBoard=Board $after $Stage
+            if($null-eq$newBoard-or$newBoard.groups.Count-lt$oldCount){
+                $actual=if($newBoard){$newBoard}else{$after.latestFreePlay}
+                AssertNativeMerge "$Name-actual-$attempt" $board $actual $pair.sid $TargetCount
+                return $after
+            }
             $board=$newBoard
         }
-        Orbit "$Name-orbit-$attempt" $board
+        Orbit "$Name-orbit-$attempt" $board -Pitch:($attempt%4-eq3)
     }
     throw "Native merge bound reached for Stage $Stage; all actual attempts retained."
 }
@@ -77,10 +84,13 @@ function SplitReal([int]$Stage,[int]$Selected,[string]$Name,[string]$OnlyId='')
         foreach($id in $ids){$board=RevealBall $Stage $id "$Name-select-reveal-$attempt-$id";TapBall "$Name-select-$attempt-$id" $board $id}
         $board=RevealBall $Stage $ids[-1] "$Name-drag-reveal-$attempt"
         $point=BallPoint $board $ids[-1]
-        Step "$Name-drag-$attempt" @('shell','input','swipe',"$($point[0])","$($point[1])","$($point[0])","$($point[1]-160)",'500')
-        $after=Save "$Name-after-$attempt"; $actual=Board $after $Stage
+        $end=@($point[0],($point[1]-160))
+        if(!(WorldSafe $end)){$end=@($point[0],($point[1]+160))}
+        $after=NativeMoveAndHold "$Name-drag-$attempt" $board $ids[-1] $end;$actual=Board $after $Stage
         if($null-eq$actual){$actual=$after.latestFreePlay}
         if($actual.groups.Count-gt$board.groups.Count){
+            Check "$Name-split-original-ids-$attempt" (Same @($board.balls.id|Sort-Object) @($actual.balls.id|Sort-Object)) 'Actual split retains all original identities exactly'
+            Check "$Name-split-manual-camera-$attempt" (Same $board.camera $actual.camera) 'Split assistance preserves the exact saved manual pose'
             if(@($actual.groups|Where-Object{(($_.ballIds|Sort-Object)-join',')-eq(($ids|Sort-Object)-join',')}).Count-ne1){
                 $commands.Add(@{command='Actual split selected IDs differ: preserve requested and actual memberships';expected=$ids;actualGroups=$actual.groups;utc=[DateTime]::UtcNow.ToString('o')})
                 if($null-eq(Board $after $Stage)){
diff --git a/tools/android/final-common.ps1 b/tools/android/final-common.ps1
index 2de30ab..9fdb5db 100644
--- a/tools/android/final-common.ps1
+++ b/tools/android/final-common.ps1
@@ -22,6 +22,54 @@ function Step([string]$Name,[string[]]$Arguments=@(),[int]$Delay=500) {
 }
 function Save([string]$Name) { Adb @('pull',$remote,(Join-Path $EvidenceDir "$Name.json")) | Out-Null; return Get-Content -LiteralPath (Join-Path $EvidenceDir "$Name.json") -Raw | ConvertFrom-Json }
 function Same($First,$Second) { return ($First | ConvertTo-Json -Depth 12 -Compress) -eq ($Second | ConvertTo-Json -Depth 12 -Compress) }
+function NativePointer([int[]]$Contacts) {
+    $touchHelper=Join-Path $PSScriptRoot 'send-composition-touch.ps1'
+    & pwsh -NoProfile -CommandWithArgs '$ErrorActionPreference="Stop"; $touchHelper=$args[0]; $touchContacts=@($args[1..($args.Count-1)]|ForEach-Object {[int]$_}); & $touchHelper -Contacts $touchContacts; exit $LASTEXITCODE' $touchHelper @Contacts
+    $actualExit=$LASTEXITCODE
+    $commands.Add(@{command='EmulatorController.sendTouch';contacts=$Contacts;exitCode=$actualExit;utc=[DateTime]::UtcNow.ToString('o')})
+    if($actualExit-ne0){throw "Actual native gesture failed: $actualExit"}
+}
+function NativeMoveAndHold([string]$Name,$Board,[string]$Id,[int[]]$End) {
+    $point=BallPoint $Board $Id
+    Check "$Name-safe-start-end" ((WorldSafe $point)-and(WorldSafe $End)) 'Current exact whole-ID projection and documented UI-safe endpoints'
+    $confirmed=Save "$Name-confirmed"
+    try {
+        NativePointer @($point[0],$point[1],79,1024);Start-Sleep -Milliseconds 100
+        # One real Move precedes assistance. Hold the finger still as the camera changes;
+        # a 500ms interpolated swipe would reuse stale screen coordinates during rotation.
+        NativePointer @($End[0],$End[1],79,1024);Start-Sleep -Milliseconds 700
+        Step "$Name-during-live-camera" @() 0
+        Check "$Name-live-preview-not-saved" (Same $confirmed (Save "$Name-during-save")) 'Stationary native contact: preview and auto camera never overwrite confirmed state'
+    } finally { NativePointer @($End[0],$End[1],79,0) }
+    Step $Name @() 2500
+    return Save "$Name-dropped"
+}
+function AssertNativeMerge([string]$Name,$Before,$After,[string]$SourceId,[int]$TargetCount=0) {
+    $idsBefore=@($Before.balls.id|Sort-Object);$idsAfter=@($After.balls.id|Sort-Object)
+    Check "$Name-exact-original-ids" (Same $idsBefore $idsAfter) 'No lost, duplicated or substituted IDs after actual native input'
+    Check "$Name-manual-camera-preserved" (Same $Before.camera $After.camera) 'Automatic assistance never persists as the manual camera'
+    $source=@($Before.groups|Where-Object {$_.ballIds-contains$SourceId})[0]
+    $merged=@($After.groups|Where-Object {$_.ballIds-contains$SourceId})[0]
+    $targets=@($Before.groups|Where-Object {$_.id-ne$source.id-and@($_.ballIds|Where-Object {$merged.ballIds-notcontains$_}).Count-eq0})
+    Check "$Name-actual-source-and-target-membership" ($targets.Count-eq1-and$merged.ballIds.Count-eq($source.ballIds.Count+$targets[0].ballIds.Count)-and@($source.ballIds|Where-Object {$merged.ballIds-notcontains$_}).Count-eq0-and($TargetCount-eq0-or$targets[0].ballIds.Count-eq$TargetCount)) 'Grabbed source plus exactly one actual foreign group; requested target size retained'
+    $firstBefore=@($Before.balls|Where-Object id -eq $SourceId)[0].position
+    $firstAfter=@($After.balls|Where-Object id -eq $SourceId)[0].position
+    $delta=[Numerics.Vector3]::new($firstAfter.x-$firstBefore.x,$firstAfter.y-$firstBefore.y,$firstAfter.z-$firstBefore.z)
+    Check "$Name-requested-source-actually-moved" ($delta.Length()-gt.00001) "Actual grabbed source $SourceId moved in 3D"
+    foreach($ball in $Before.balls){
+        $actual=@($After.balls|Where-Object id -eq $ball.id)[0].position
+        if($source.ballIds-contains$ball.id){
+            $movement=[Numerics.Vector3]::new($actual.x-$ball.position.x,$actual.y-$ball.position.y,$actual.z-$ball.position.z)
+            Check "$Name-rigid-source-$($ball.id)" (($movement-$delta).Length()-lt.0001) 'Every source member shares the same actual translation'
+        }else{Check "$Name-stationary-foreign-$($ball.id)" (Same $ball.position $actual) 'Unselected foreign balls retain exact saved positions'}
+    }
+    $distance=[double]::PositiveInfinity
+    foreach($sid in $source.ballIds){foreach($tid in $targets[0].ballIds){
+        $s=@($After.balls|Where-Object id -eq $sid)[0].position;$t=@($After.balls|Where-Object id -eq $tid)[0].position
+        $distance=[Math]::Min($distance,[Numerics.Vector3]::new($s.x-$t.x,$s.y-$t.y,$s.z-$t.z).Length())
+    }}
+    Check "$Name-real-three-dimensional-contact" ($distance-ge.998-and$distance-le1.002) "Actual source/foreign unit-sphere contact distance=$distance; screen overlap alone is insufficient"
+}
 function BallPoint($Board,[string]$Id) {
     $matching=@($Board.balls | Where-Object id -eq $Id)
     if ($matching.Count -ne 1) { throw "Native projection requires exactly one existing ball ID: $Id" }
diff --git a/tools/android/test-final-live-drag.ps1 b/tools/android/test-final-live-drag.ps1
new file mode 100644
index 0000000..10fa37f
--- /dev/null
+++ b/tools/android/test-final-live-drag.ps1
@@ -0,0 +1,87 @@
+param([Parameter(Mandatory)][string]$EvidenceDir,[Parameter(Mandatory)][string]$Fixture,[string]$CommonSource=(Join-Path $PSScriptRoot 'final-common.ps1'),[string]$ProgressionSource=(Join-Path $PSScriptRoot 'exercise-final-progression.ps1'))
+$ErrorActionPreference='Stop'
+New-Item -ItemType Directory -Path $EvidenceDir -Force|Out-Null
+$checks=[Collections.Generic.List[object]]::new()
+function Record([string]$Id,[bool]$Passed,$Actual){$checks.Add(@{id=$Id;passed=$Passed;actual=$Actual})}
+function ReadFunction([string]$Path,[string]$Name){
+    $ast=[Management.Automation.Language.Parser]::ParseFile($Path,[ref]$null,[ref]$null)
+    $function=$ast.Find({param($n)$n-is[Management.Automation.Language.FunctionDefinitionAst]-and$n.Name-eq$Name},$true)
+    if(!$function){throw "Missing production function: $Name"}
+    $expected=$function.Extent.Text.Replace("function $Name","function global:$Name")
+    . ([scriptblock]::Create($expected))
+    $actual=(Get-Command -Name $Name -CommandType Function).ScriptBlock.Ast.Extent.Text
+    Record "$Name-loaded-production-function" ($actual-ceq$expected) @{source=$Path;expectedSha256=[Convert]::ToHexString([Security.Cryptography.SHA256]::HashData([Text.Encoding]::UTF8.GetBytes($expected)));actualSha256=[Convert]::ToHexString([Security.Cryptography.SHA256]::HashData([Text.Encoding]::UTF8.GetBytes($actual)))}
+    if($actual-cne$expected){throw "Production function is shadowed: $Name"}
+}
+$raw=Get-Content -LiteralPath $Fixture -Raw|ConvertFrom-Json
+$board=@($raw.puzzleStates|Where-Object stageId -eq 5)[0]
+if(!$board-or$board.groups.Count-ne2-or$board.balls.Count-ne5){throw 'Requires actual failed Stage5 final two-group save'}
+$commands=[Collections.Generic.List[object]]::new();$script:pointCalls=0
+function Check([string]$Id,[bool]$Passed,[string]$Actual){if(!$Passed){throw "$Id : $Actual"}}
+function Adb([string[]]$Arguments){return 'Physical size: 1080x2400'}
+function Step([string]$Name,[string[]]$Arguments=@(),[int]$Delay=500){$commands.Add(@{name=$Name;arguments=$Arguments})}
+function Save([string]$Name){return $raw}
+function global:NativeMoveAndHold([string]$Name,$Board,[string]$Id,[int[]]$End){$commands.Add(@{nativeHeldMove=$true;id=$Id;end=$End});return $raw}
+try{
+    foreach($name in @('BallPoint','WorldSafe','BallClear','Same')){ReadFunction $CommonSource $name}
+    foreach($name in @('Board','Orbit','MergeReal')){ReadFunction $ProgressionSource $name}
+    $bound=$false;$replayError=$null;try{MergeReal 5 'replay-actual-stage5'|Out-Null}catch{$replayError=$_.Exception.Message;$bound=$replayError-match'Native merge bound reached'}
+    $pitch=@($commands|Where-Object {$_.arguments.Count-ge7-and$_.arguments[2]-eq'swipe'-and$_.arguments[3]-eq$_.arguments[5]-and$_.arguments[4]-ne$_.arguments[6]})
+    Record 'failed-original-save-exercises-both-native-orbit-axes' ($bound-and$pitch.Count-gt0) @{boundedFailureRetained=$bound;pitchCommands=$pitch.Count;commands=$commands.Count;error=$replayError}
+    ReadFunction $CommonSource 'NativeMoveAndHold'
+    $script:touches=[Collections.Generic.List[object]]::new()
+    function NativePointer([int[]]$Contacts){$script:touches.Add(@($Contacts))}
+    function Start-Sleep {}
+    $commands.Clear()
+    $start=BallPoint $board 's05-b04';$end=@(($start[0]+40),$start[1])
+    NativeMoveAndHold 'offline-held-drag' $board 's05-b04' $end|Out-Null
+    Record 'single-current-projection-move-held-then-released' ($script:touches.Count-eq3-and$script:touches[0][3]-eq1024-and$script:touches[1][0]-eq$end[0]-and$script:touches[1][3]-eq1024-and$script:touches[2][3]-eq0) $script:touches.ToArray()
+    foreach($case in @(@{id='missing';end=$end},@{id='s05-b04';end=@(312,108)},@{id='s05-b04';end=@(1200,900)})){
+        $script:touches.Clear();$rejected=$false;try{NativeMoveAndHold 'invalid-held-drag' $board $case.id $case.end|Out-Null}catch{$rejected=$true}
+        Record 'unsafe-or-missing-ID-rejected-before-native-touch' ($rejected-and$script:touches.Count-eq0) $case
+    }
+    function Save([string]$Name){if($Name-match'during'){ $changed=$raw|ConvertTo-Json -Depth 20|ConvertFrom-Json;$changed.completedStageIds+=5;return $changed };return $raw}
+    $script:touches.Clear();$rejected=$false;try{NativeMoveAndHold 'changed-preview' $board 's05-b04' $end|Out-Null}catch{$rejected=$true}
+    Record 'persisted-preview-is-rejected-and-contact-released' ($rejected-and$script:touches.Count-eq3-and$script:touches[-1][3]-eq0) $script:touches.ToArray()
+    ReadFunction $CommonSource 'AssertNativeMerge'
+    $success=$board|ConvertTo-Json -Depth 20|ConvertFrom-Json
+    $source=@($board.groups|Where-Object {$_.ballIds-contains's05-b04'})[0]
+    $target=@($board.groups|Where-Object {$_.ballIds-notcontains's05-b04'})[0]
+    $anchor=@($success.balls|Where-Object id -eq 's05-b01')[0].position
+    @($success.balls|Where-Object id -eq 's05-b04')[0].position=[pscustomobject]@{x=($anchor.x-1);y=$anchor.y;z=$anchor.z}
+    $success.groups=@([pscustomobject]@{id='actual-merged';ballIds=@($source.ballIds)+@($target.ballIds)})
+    $accepted=$true;$contactError=$null;try{AssertNativeMerge 'offline-valid-contact' $board $success 's05-b04' 0}catch{$accepted=$false;$contactError=$_.Exception.Message}
+    Record 'actual-ID-rigid-contact-oracle-positive-control' $accepted @{scope='Counterfactual offline geometry control; never native completion evidence';error=$contactError}
+    foreach($kind in @('missing-ID','duplicate-ID','wrong-membership','foreign-moved','deep-screen-overlap','manual-camera-changed','zero-source-motion')){
+        $bad=$success|ConvertTo-Json -Depth 20|ConvertFrom-Json
+        switch($kind){
+            'missing-ID'{$bad.balls=@($bad.balls|Where-Object id -ne 's05-b04')}
+            'duplicate-ID'{$bad.balls+=@($bad.balls[0])}
+            'wrong-membership'{$bad.groups[0].ballIds=@($target.ballIds)}
+            'foreign-moved'{$bad.balls[0].position.x+=.1}
+            'deep-screen-overlap'{@($bad.balls|Where-Object id -eq 's05-b04')[0].position.z+=3}
+            'manual-camera-changed'{$bad.camera.distance+=.1}
+            'zero-source-motion'{@($bad.balls|Where-Object id -eq 's05-b04')[0].position=@($board.balls|Where-Object id -eq 's05-b04')[0].position}
+        }
+        $rejected=$false;try{AssertNativeMerge "offline-$kind" $board $bad 's05-b04' 0}catch{$rejected=$true}
+        Record 'invalid-native-result-is-rejected' $rejected $kind
+    }
+    $multi=$board|ConvertTo-Json -Depth 20|ConvertFrom-Json
+    $sourcePosition=@($board.balls|Where-Object id -eq 's05-b01')[0].position
+    $targetPosition=@($board.balls|Where-Object id -eq 's05-b04')[0].position
+    $translation=[Numerics.Vector3]::new($targetPosition.x+1-$sourcePosition.x,$targetPosition.y-$sourcePosition.y,$targetPosition.z-$sourcePosition.z)
+    foreach($ball in $multi.balls|Where-Object id -ne 's05-b04'){$ball.position.x+=$translation.X;$ball.position.y+=$translation.Y;$ball.position.z+=$translation.Z}
+    $multi.groups=$success.groups
+    $accepted=$true;$contactError=$null;try{AssertNativeMerge 'offline-four-source-contact' $board $multi 's05-b01' 1}catch{$accepted=$false;$contactError=$_.Exception.Message}
+    Record 'four-member-rigid-source-contact-positive-control' $accepted @{scope='Offline counterfactual control; all four source members translated equally';error=$contactError}
+    foreach($kind in @('partial-source-motion','wrong-target-size')){
+        $bad=$multi|ConvertTo-Json -Depth 20|ConvertFrom-Json
+        $targetSize=1
+        if($kind-eq'partial-source-motion'){@($bad.balls|Where-Object id -eq 's05-b02')[0].position.y+=.01}else{$targetSize=2}
+        $rejected=$false;try{AssertNativeMerge "offline-$kind" $board $bad 's05-b01' $targetSize}catch{$rejected=$true}
+        Record 'invalid-group-translation-or-target-size-is-rejected' $rejected $kind
+    }
+}catch{Record 'production-function-evaluation' $false $_.Exception.Message}
+$passed=$checks.Count-gt0-and@($checks|Where-Object passed -ne $true).Count-eq0
+@{passed=$passed;scope='Offline actual failed save replay and native-input/assertion negative controls; no ADB, no Unity, no native success claim';fixture=$Fixture;fixtureSha256=(Get-FileHash -LiteralPath $Fixture).Hash;commonSource=$CommonSource;commonSha256=(Get-FileHash -LiteralPath $CommonSource).Hash;progressionSource=$ProgressionSource;progressionSha256=(Get-FileHash -LiteralPath $ProgressionSource).Hash;checks=$checks.ToArray()}|ConvertTo-Json -Depth 12|Set-Content -LiteralPath (Join-Path $EvidenceDir 'live-drag-result.json')
+if(!$passed){exit 1};exit 0