diff --git a/research/karman_reproduce/run.py b/research/karman_reproduce/run.py
index 2bc0606..88acebe 100644
--- a/research/karman_reproduce/run.py
+++ b/research/karman_reproduce/run.py
@@ -76,9 +76,11 @@ def main():
         # Legacy build_karman_cloak order: stabilize disturbance + probes, then the
         # 150-interval zero-action target sampling (kept as flow time), then the pinball.
         sim.run(WARMUP + FIFO_LEN * SI)
-        pinball = [sim.add_body("circle", center=c, radius=R)
-                   for c in ((30 * L0, YC, 0.0), (626.0, YC + 15, 0.0), (626.0, YC - 15, 0.0))]
+        n0 = sim.bodies.count
+        for c in ((30 * L0, YC, 0.0), (626.0, YC + 15, 0.0), (626.0, YC - 15, 0.0)):
+            sim.add_body("circle", center=c, radius=R)  # pending (negative) id until sync
         sim.sync_bodies()
+        pinball = list(range(n0, n0 + 3))  # committed ids, as in f2f88c phase3
         sim.run(WARMUP)
         cells = float(len(sim.bodies.get(probes[0]).get_sensor_list(NX, NY)[0]))  # probe sum = mean * cells