The problem is, for the most part, legally you're allowed to defend yourself to stop the attack. Once the attack is stopped, anything you do after that is considered assault (or worse). Once you are safe, anything else you do to stop the person from committing crimes in the future, outside of the law, is called vigilantism. I would say that a choke is a lethal technique, because if you apply the hold correctly to get someone to tap out or pass out, you are applying the hold correctly to kill them. It will just take more time. With a punch, yes I can keep punching, but I have to keep connecting. With a choke, once I've gotten control, it's over.