Well, yeah I didn't think this required mentioning, since there's no indication that he gets extra lives, or any other contingency against getting absolutely destroyed. To be fair, that world is already ridiculous, since to be able to casually rip off someone's jaw one-handed, you'd have to be a fucking terminator (and even then, you'd need leverage, since inertia would just drag the rest of the body along). Still, even a terminator would get overwhelemed by al arge group of people, no matter how unskilled or unarmed.It also makes sense that he prefers to not fight unless he has a very strong advantage, since one mistake could cost him his life. This is more or less the approach in the wild, eg, a cat will not fight a rat if it can help it and instead wait for a mouse. The rat is certainly going to avoid fighting the cat if it can, despite having a chance to win.
The exact power scaling of face ripping guy in a 1v1, meaning who is the cat and who is the rat, is not clear. However, it seems to be the kind of environment where it's hard to survive if you aren't part of a faction.