2 Part Technique - Upon realizing that your opponent has lost the battle for the underhook in half guard, he may try to turn the situation back to his favor by switching controls and locking the Kimura grip on your underhook. Before he can do so, hide your arm by cupping behind his tricep and work to insert your butterfly hook from half guard by extending your leg against his. Post your other foot onto the mat to help bridge him over with the Hook Sweep and finishing with Head and Underhook Control. If he posts against the Hook Sweep with his free leg, use the space underneath his base to enter into X-Guard and finish with the Unbalance Sweep.