diff --git a/src/AcDream.UI.Abstractions/Panels/Debug/DebugVM.cs b/src/AcDream.UI.Abstractions/Panels/Debug/DebugVM.cs
index 731ee9e..a761738 100644
--- a/src/AcDream.UI.Abstractions/Panels/Debug/DebugVM.cs
+++ b/src/AcDream.UI.Abstractions/Panels/Debug/DebugVM.cs
@@ -359,6 +359,18 @@ public sealed class DebugVM
         set => PhysicsDiagnostics.ProbeIndoorBspEnabled = value;
     }
 
+    /// <summary>
+    /// Phase A6.P1 cdb probe spike (2026-05-21). Runtime mirror of
+    /// <see cref="PhysicsDiagnostics.ProbePushBackEnabled"/> (env var
+    /// <c>ACDREAM_PROBE_PUSH_BACK</c>). Toggling here flips the three
+    /// <c>[push-back]</c> emission sites live — no relaunch required.
+    /// </summary>
+    public bool ProbePushBack
+    {
+        get => PhysicsDiagnostics.ProbePushBackEnabled;
+        set => PhysicsDiagnostics.ProbePushBackEnabled = value;
+    }
+
     /// <summary>
     /// Runtime mirror of <c>RenderingDiagnostics.IndoorAll</c> — toggles all
     /// five indoor probes together. No dedicated env var; set any individual