I messed around and figured out how to do it, you have to have your feet touch a box, person or object as they fall then very quickly do a jump kick, delaying the kick to get more distance. You either get out or make it to the wall and can climb out. It's just very hard to do and the timing is tough. I'd say it's luck but the guy I mentioned did it 3 times in one game, and it was obvious he had practice doing it.