When your opponent gets the double unders, immediately feed your arm across and under their armpit. Your opponent will be unable to stack you. Reinforce your grip of the armpit by grabbing over with your other hand. Extend your leg to nullify the strength of your opponents arm. Pull them to you and insert your knee under your their stomach to prevent them from jumping over. Grab around your opponents waist, post your hand on the mat, and pull your leg out while bringing your opponents arm with you. Get the seatbelt, drive your shoulder to the back of their head, shift your hips, and put in the top hook. Your opponent may attempt to release their arm, but either way, shrimp in, insert the bottom hook and you will establish back control.