oh brother did you learn this from a espn
Nah, my brother and I train using police technique videos. Some very good stuff. If you're ever in a spot where someone starts shooting - even if you're unarmed - use your left hand cupped over your face and forearm over your heart internals. Just that quick arm raise beings your chances of being fatally hit down significantly.
With the right hand, you either pull your own piece, pick up something to throw, or push open an exit door.
The reverse/angled exit makes it tougher for the guy to hit you - a moving erratic target, and he's crossing his own body to fire reduces chance you'll be hit.
The hips, well, that is obvious. when he's shooting, you reverse to avoid the hips as well. if his hips are square with yours, you will likely be hit. If they're not, it's likely you don't get hit. Hips mean everything.
You can shit all over this, but I'm sure that bench or some of our other LEO types here will tell you it's better than standing there pissing yourself scared.