Crazy game there matey! When I was younger me and my mates used to play this game where two of us would fight each other and when the first blood is drawn the game is over. The winner is who's not bleeding, as soon as you shed a drop of blood you lose. There used to be this one guy who filed his nails into points, whe used to be like Freddy Kruegar with that shit! Can't say ive played in a while, but it certainly toughend me up.

Peace

Buddy