As a martial artist with over ten years of experience, I must say that the detail in that scene was quite impressive. A small improvement to make for next time would be the headbutt. You don't headbutt by bashing your forehead into a person, it hurts you too much. You use the top of your head which is much harder. And to answer Jefferson's question, it takes much less force than people think to break a bone. It takes about six pounds of pressure to break an elbow, even less than that to break fingers.

Sorry, couldn't help it, I'm a martial arts nerd.