If you MUST fight (and flight is preferable, really), go all out. Immediately. Don't hold back. Kick, scream, bite, scratch, scream -- and if you have taken a voice or acting course (or if you sing), you'll know how to project your voice.

Do so.

I've even heard of a martial art based upon the voice. Can't remember what it's called, but from personal experience I know how effective the human voice can be when used correctly (envision a Marine Corps Drill Instructor chewing out a recruit -- the DI is acting, actually, but he certainly seems angry...).