2 Part Technique - Insert a butterfly hook from Half Guard when you encounter the Over Under Pass, and use it to lift weight off of your chest so that you can turn onto your side for the Hook Sweep. Since your opponent will be holding onto an overhook, it will be hard to turn onto your side for the sweep by simply sitting up onto your elbow. If you meet difficulty inserting the butterfly hook, try hip-escaping and sneaking your foot under his leg higher up than before. If he keeps his head tight against yours, making it hard to pummel for Over Under Control, utilize the Frame Escape to make distance for your underhook and kick him over with the Hook Sweep.