2 Part Technique - If you lose the underhook battle and your opponent scores it first versus your half guard, don't let him establish the "Over" part of the Over Under Pass. Either block his arm with your hand or forearm, depending on the distance, and hip escape until you create enough space to insert a butterfly hook from half guard. Secure his belt over the top of his shoulder and continue to hold off his arm with the inside tie as you execute a hook sweep. Since you can't get under his base like with an underhook, if the opponent posts his foot well, you will not be able to continue finishing the sweep. Instead, grab onto his wrist and push it between your legs during the sweep to finish with the triangle choke.