Drop a weighted rope from a pulley, and anything attached to that rope that weighs less will follow. That's the principle this technique works on, making it one of the few ways to escape from the Rear Naked Choke. Other reels advise scooching your own hips and feet behind uke while he's applying this choke, and then flipping him laterally over your back, and I will contend that such is just not possible. Your neck is being controlled and your cervical vertebrae are being depressed! You cannot sh