He might be able to kill you, and he would if he could. You could kill him just as easily too, with virtually no blame. What would you do?
I think that the answer here is pretty obvious, you would kill him. You aren’t going to just turn your back on someone who hates your guts, especially because chances are he can kill you. Even if the chances are small, you’ve gotta be fucking retarded to risk that, I don’t care how “moral” or whatever the fuck you are trying to be. Think.
I would never get into any situation like that. But on the very off chance I did, I would try to talk them out of it first. And when that doesn’t work, just focus on hitting certain areas, before taking my leave.