Standing rear choke. You gotta guy grabbing you by the throat from behind. First thing you do, you do not panic. You must not panic. Notice my hands are already at his hands. Why? Because I'm going to use this to survive. Survive meaning buy yourself an inch, or even just half an inch of space. Never expect to just yank the guys hand off. Assume he's stronger than you. So, I pull on his hand just a bit. At this point now, his hips are lined up with mine. All I need to do is squat. I squat and when I come back up, the attacker is on my hips. And now, I just throw him over. And that's a defense, the standing rear naked choke.