
When you are entering a fight as an underdog, be it because you are some angry at the world skinny asshole who never knew when to back down ( like I was ), or a decent upstanding citizen who doesn't want to be a victim ( like you guys ) then you need an equaliser.
The best equaliser which isn't an actual weapon is being prepared to go a little bit further than the other guy. Biting is an awesome technique. Being bitten by another human being is extremely painful but also demoralizing. I have seen it end fights very quickly.
The last time I used it was when I got into a brawl at a biker pub. I didn't start it, but I deliberately over reacted to a minor insult because the local chapter of the Hells Angels were there and being an asshole I didn't want to lose face in front of them

I hit the guy first, we swapped some punches and then he got me in a headlock. I didn't even have to think about what to do next, I just bit his inner thigh as hard as I could.
One second he's winning, the next he's screaming " He bit me, he bit me !!!! " like a little bitch.
He, like 90% of people you will meet, was prepared to trade punches and wrestle, but he gave up almost instantly when confronted with someone who was going to do whatever it took to win.