As an actor, it's all about whether you can sell the emotion on your face... that desperation, the panic and rage that comes with combat. The emotion of combat is important to me. I mean, you feel almost sick if you see a real fight where someone is getting badly beaten up. You can get emotionally involved in combat that has nothing to do with you in real-life, let alone if you are actually in it... or it's someone you know, and so you should have those same feelings on film.