They way Alder shows to clasp hands trapping the foot at instep is my prefered method. Sometimes I even grad the toes from around the back, pull out my bottom arm and post it, kinda like dogfight with the far foot trapped. It is also pretty easy to switch to the truck from there. Sometimes, I even grab the ankle and really pull it to my face. If they guy doesn't have lotus flexibility it puts some strain on the knee and they are more than happy to fall back. Like someone else said, if they sprawl that leg, go to eletric chair, or even FG.