actually, depending on who it's against, a rabbit would last quite a while in a knife fight. One would also have to take into consideration the physical condition of said rabbit, and the location of the knife fight, but with a large enough area, and if the rabbit is able-bodied, it could last quite a while. Unless, of course, the opponent is a circus knife-thrower. If it's a circus knife-thrower, then the rabbit is fucked.