User blog comment:Rassilon of Old/Young Justice spoilers at Comic-Con 2012/@comment-4661035-20120723132732/@comment-174.16.103.155-20120724153252

I was thinking about that too, and that knee kick to the head would have been a K.O! I know because I take karate, I know how to do K.O with elbows, and she was spinning so momentum + she hit a knock-out spot, the jaw is a major knock-out spot if you hit it in the right place.