Nobody wants to be in a fight
I think this is pretty obviously untrue. For one thing, to be pedantic, if one person is trying to get away (i.e., doesn't want to be there), that's not normally called a 'fight', it's an attack, which isn't the same thing (and would require different strategies as well).
In any case, if nobody really wanted to be in a fight, there wouldn't be so many fights. This is especially true when people start talking about 'street fights' and 'bar fights', which seem to be pretty much entirely avoidable, and easily so, with very few exceptions.
Personally, I'm not going to waste my time trying to figure out how to win a 'bar fight'. Don't go to places there are likely to be bar fights, don't stay in a place where there are people who seem 'off' in any way, and don't get in arguments with crazy people. Voila, problem solved.
Muggings and the like are a far more interesting problem.