* L.2g S2-blocker trace — what does a RETAIL OBSERVER do with ACE's
* flags=0 "empty" UpdateMotion while the actor toggles walk/run?
*
* Attach target: the retail OBSERVER client (standing still, watching).
* Driver: the user Shift-toggles + starts/stops the ACTOR from the other
* retail client.
*
* Expected chain per decomp (to confirm or refute):
*   CPhysics::SetObjectMovement (gates, stamps)          [SOM]  + obj id
*   MovementManager::unpack_movement (10-way dispatch)   [UNPACK]
*   CMotionInterp::move_to_interpreted_state (flat copy) [MTIS] + IMS dump
*   CMotionInterp::apply_interpreted_movement            [AIM]
*   CMotionInterp::apply_raw_movement (local-player alt) [ARM]
*   CMotionInterp::DoInterpretedMotion per axis          [DIM]  + motion id
*
* The [MTIS] InterpretedMotionState dump on an empty UM is THE answer:
* if forward_command=0x41000003 (Ready) is flat-applied and [DIM] shows
* Ready, retail really does stop the remote — and the observer's clean
* rendering must come from somewhere else. If the dump or the DIM stream
* shows something else (e.g. WalkForward), we found the mechanism.
*
* Auto-detach: after 600 SetObjectMovement hits via .detach (NOT qd —
* qd is silently ignored in bp actions, see project_retail_debugger.md).

.logopen C:\Users\erikn\source\repos\acdream\.claude\worktrees\vigorous-joliot-f0c3ad\l2g-observer-trace.log
.sympath C:\Users\erikn\source\repos\acdream\refs
.symopt+ 0x40
.reload /f acclient.exe

x acclient!CPhysics::SetObjectMovement
x acclient!MovementManager::unpack_movement
x acclient!CMotionInterp::move_to_interpreted_state
x acclient!CMotionInterp::DoInterpretedMotion

r $t0 = 0
bp acclient!CPhysics::SetObjectMovement "r $t0 = @$t0 + 1; .printf \"\\n[SOM %d] obj=%p movSeq=%x scSeq=%x auto=%x id: \", @$t0, poi(@esp+4), poi(@esp+10)&0xffff, poi(@esp+14)&0xffff, poi(@esp+18); dt acclient!CPhysicsObj poi(@esp+4) id; .if (@$t0 >= 250) { .detach } .else { gc }"
bp acclient!MovementManager::unpack_movement ".printf \"[UNPACK] mm=%p\\n\", @ecx; gc"
bp acclient!CMotionInterp::move_to_interpreted_state ".printf \"[MTIS] minterp=%p ims:\\n\", @ecx; dt acclient!InterpretedMotionState poi(@esp+4); gc"
bp acclient!CMotionInterp::apply_interpreted_movement ".printf \"[AIM] minterp=%p\\n\", @ecx; gc"
bp acclient!CMotionInterp::apply_raw_movement ".printf \"[ARM] minterp=%p\\n\", @ecx; gc"
bp acclient!CMotionInterp::DoInterpretedMotion ".printf \"[DIM] minterp=%p motion=%08x\\n\", @ecx, poi(@esp+4); gc"
g