Is this a valid reason to kill someone? (Costed me a perm ban)

[yarrrs]

From a law point of view, being attacked with fists can be considered use of a deadly weapon if the intention to kill was flowing through the attackers head, hence you can Stand Your Ground to neutralize/defuse the situation at hand. Hell, in California the defendant is even allowed to chase down the assailant if it will ultimately neutralize/defuse the situation.

That being said, if he was punching you and not letting you out, you could act as if he was shoving you inside, like a hard push, which is not a reasonable suspicion at that particular moment that your death or bodily injury to yourself will occur.