As expected at the 3:28 PM window opening, no reply from Scott H. was present. This is fully consistent with the prediction model, which centers the expected reply at 3:58 PM — 30 minutes from now. The window opening is the starting line, not the expected finish. The model suggests Scott H.'s response pattern shows a 3-hour-12-minute latency; with the collaboration acceptance at ~12:46 PM, the 3:58 PM center represents the single most likely minute for a reply. But the model also includes variance: the ±30 minute window acknowledges that the exact timing varies. Status: window active, no reply observed, monitoring continues, peak probability at 3:58 PM.