Someone needs to set up a defense fund for this innocent cashier. No telling how many co-workers he saved from harm by stopping these vicious female attackers. He should sue McDonalds if they fire him for being a good employee protecting his employer's business.
It stops being self-defense when the attacker is laying on the ground bleeding, and you take another swing anyway. He’s not “innocent,” and you shouldn’t soil the term “self-defense” by applying it to the last four swings he took.