diff --git a/src/AcDream.App/Rendering/GameWindow.cs b/src/AcDream.App/Rendering/GameWindow.cs
index 5edfaee4..f629da8a 100644
--- a/src/AcDream.App/Rendering/GameWindow.cs
+++ b/src/AcDream.App/Rendering/GameWindow.cs
@@ -4977,6 +4977,29 @@ public sealed class GameWindow : IDisposable
                                 Speed: item.Speed));
                         }
                         ims.Actions = actionList;
+
+                        // #170 capture aid (ACDREAM_DUMP_MOTION): dump the
+                        // REMOTE inbound action list WITH stamps — the
+                        // existing UM line only shows ForwardCommand, and the
+                        // [CMD_LIST] dump is local-player only. This is what
+                        // answers "do the attack stamps advance (variety) or
+                        // repeat (uniform)?". Strip once #170 is understood.
+                        if (Environment.GetEnvironmentVariable("ACDREAM_DUMP_MOTION") == "1")
+                        {
+                            var sb = new System.Text.StringBuilder();
+                            sb.Append(System.FormattableString.Invariant(
+                                $"UM    ↳ actions guid=0x{update.Guid:X8} mt=0x{update.MotionState.MovementType:X2} fwd=0x{ims.ForwardCommand:X8} ["));
+                            for (int ai = 0; ai < actionList.Count; ai++)
+                            {
+                                var a = actionList[ai];
+                                var rt = AcDream.Core.Physics.AnimationCommandRouter.Classify(a.Command);
+                                if (ai > 0) sb.Append(", ");
+                                sb.Append(System.FormattableString.Invariant(
+                                    $"0x{a.Command:X8}({rt}) stamp={a.Stamp} auto={a.Autonomous} spd={a.Speed:F2}"));
+                            }
+                            sb.Append(']');
+                            Console.WriteLine(sb.ToString());
+                        }
                     }
 
                     // R2-Q5/R3-W4: funnel dispatches go STRAIGHT into the