He has a whole series on the "Rat" guard. Been workin' it about a year. I'm in it almost every rolling session at least once. I can hold people in it to keep posture broke, but that is about it. Very stale position to move from, I use it with a body triangle for a very tight clinch. Might be ok in MMA for a major stall. You can go right to chill dog, but it is tough because the persons shoulder in usually in my throat. The hip bump sweep worked at first, now nobody sits up. If your really good @ butterfly guard, it might be worth trying. I'm spending my time drilling the butterfly sweeps, once I get great at that this position might become more usefull. If your a kimura from closed guard player, then it is right there from a failed attempt. Big negative. If you let go and he gets past your guard, your already caught in the head and arm choke.