To be fair the legal use of lethal force involves an intent to stop the perpetrator, not to kill him. You can very much get yourself convicted of murder in what

To be fair the legal use of lethal force involves an intent to stop the perpetrator, not to kill him. You can very much get yourself convicted of murder in what would otherwise be a self defense case if a jury is convinced you were looking to kill someone intentionally. That’s why among other reasons you should call for an ambulance immediately and politely keep your mouth shut until you speak with your lawyer.