So I've read a lot on martial artist (legitimate too, not just fictional) philosophy and often hear that when you are in a fight concerning your safety, it is necessary to maintain dignity and not resort to "dirty" fighting.
What I mean by that is if someone threatens you, you just beat them down physically but at no point resort to something like pulling out a knife or kicking them in the crotch or biting them.
But to your eyes, is this legit or do you think anything is fair game in a fight for your life/well being? Like if some big burly guy tries to mug you, would it be disgusting to do something like feign defeat and pull out a revolver while cowering?