Is it alright for a guy to hit a girl even after a girl has hit him?

I think it's wrong but of course there's a few things that override that. If his life was in danger or the life of a loved one is directly endangered by a particular female, it may be alright to use a little force to extinguish that situation. Also, if the girls outweighs the guy by at least 65 lbs, that situation may be permissible for the guy to hit that girl.