It takes a serious load of testosterone to launch a coordinated attack while unarmed on a man with a firearm who is shooting those ahead of you. In war you are a hero if you do this. On the street I don't know what you are because I have never seen anyone do this. They run. If they don't and you are half decent with your gun you will take a bunch with you.
If they all attack you are in trouble. I just don't believe they will attack in the face of deadly fire.