diff --git a/src/hooks/useControllerGrab.ts b/src/hooks/useControllerGrab.ts
index 0a331f8..a2526ee 100644
--- a/src/hooks/useControllerGrab.ts
+++ b/src/hooks/useControllerGrab.ts
@@ -53,6 +53,8 @@ export function useControllerGrab() {
   const { gl } = useThree();
 
   useFrame((_state, _delta, frame: XRFrame | undefined) => {
+    const locked = useModelStore.getState().isLocked;
+
     // DEVKIT: fake-input branch — bypasses real WebXR when SimXR is active.
     if (isFakeActive()) {
       for (const hand of ['left', 'right'] as const) {
@@ -62,6 +64,13 @@ export function useControllerGrab() {
         slot.triggerValue = fake.triggerValue;
         slot.hasPose = fake.hasPose;
         slot.gripWorld.copy(fake.gripWorld);
+        if (locked) {
+          if (slot.isGrabbing) {
+            slot.isGrabbing = false;
+            console.log(`[XR][grab] ◼ ${hand} END (locked)`);
+          }
+          continue;
+        }
         if (!slot.isGrabbing && fake.gripValue > GRAB_ON) {
           slot.isGrabbing = true;
           console.log(`[XR][grab] ▶ ${hand} START (fake v=${fake.gripValue.toFixed(2)})`);