diff --git a/src/AcDream.App/Rendering/GameWindow.cs b/src/AcDream.App/Rendering/GameWindow.cs
index 9fc7279..ecd3bda 100644
--- a/src/AcDream.App/Rendering/GameWindow.cs
+++ b/src/AcDream.App/Rendering/GameWindow.cs
@@ -2832,14 +2832,29 @@ public sealed class GameWindow : IDisposable
                 {
                     var sequencer = new AcDream.Core.Physics.AnimationSequencer(setup, mtable, _animLoader);
 
-                    const uint NonCombatStance = 0x80000001u;
+                    // Style key is `0x80000000 | stance`. ACE's MotionStance.NonCombat
+                    // is 0x3D (61 decimal), NOT 0x01. Verified live: ACE broadcasts
+                    // UpdateMotion with stance=0x003D and the sequencer keys cycles
+                    // by style=0x8000003D. An earlier B.4c seed used the wrong
+                    // 0x80000001 value, which made HasCycle always return false ->
+                    // SetCycle never fired -> sequencer empty -> Advance returned
+                    // no frames -> per-frame tick collapsed all door parts to the
+                    // entity origin (visible as "door halfway in the ground").
+                    const uint NonCombatStyle = 0x8000003Du;
                     const uint MotionOn = 0x4000000Bu;   // ACE MotionCommand.On (door open)
                     const uint MotionOff = 0x4000000Cu;  // ACE MotionCommand.Off (door closed)
                     const uint EtherealPs = 0x4u;
+                    // Prefer the spawn's wire-level stance if provided; else default
+                    // to NonCombat. (Doors normally don't carry an initial MotionState
+                    // on spawn — falling back to NonCombat matches ACE Door.cs:43.)
+                    ushort spawnStance = spawn.MotionState?.Stance ?? 0;
+                    uint initialStyle = spawnStance != 0
+                        ? (0x80000000u | (uint)spawnStance)
+                        : NonCombatStyle;
                     uint spawnState = spawn.PhysicsState ?? 0u;
                     uint initialCycle = (spawnState & EtherealPs) != 0 ? MotionOn : MotionOff;
-                    if (sequencer.HasCycle(NonCombatStance, initialCycle))
-                        sequencer.SetCycle(NonCombatStance, initialCycle);
+                    if (sequencer.HasCycle(initialStyle, initialCycle))
+                        sequencer.SetCycle(initialStyle, initialCycle);
 
                     var template = new (uint, IReadOnlyDictionary<uint, uint>?)[meshRefs.Count];
                     for (int i = 0; i < meshRefs.Count; i++)
@@ -2861,7 +2876,7 @@ public sealed class GameWindow : IDisposable
 
                     if (AcDream.Core.Physics.PhysicsDiagnostics.ProbeBuildingEnabled)
                         Console.WriteLine(System.FormattableString.Invariant(
-                            $"[door-anim] registered guid=0x{spawn.Guid:X8} entityId=0x{entity.Id:X8} mtable=0x{mtableId:X8} initialCycle=0x{initialCycle:X8}"));
+                            $"[door-anim] registered guid=0x{spawn.Guid:X8} entityId=0x{entity.Id:X8} mtable=0x{mtableId:X8} initialStyle=0x{initialStyle:X8} initialCycle=0x{initialCycle:X8}"));
                 }
             }
         }