1. At sidemount, grab the end of your gi (nearest to the op) and and feed it under your op's head. Make sure he is flat and his arm is immobilized ( that is, it's not tucked enough for him to turn to his side)
2. At a flick of your elbows, your forearm should push his neck down. Make sure you're not hitting the chin.
3. With your free arm, reach under to grab the bicep of his immobilized arm.
Gosh I forgot! Will check it out again by Wednesday.