Not cool... I'm sorry, but in that situation, I would've gotten in the car and drove off (leaving her ass there in the rain) the FIRST time she swung on me. Don't get me wrong, if you're cornered, try to get out of the situation and can't... I can see popping her once (seriously, that's all it would take), to put things in perspective, but literally beating her unconscious was completely uncalled for.
Could have killed her, head trauma.
Sure, she was out of line hitting him... but it was his fault for taking it, and it was his fault for retaliating to such a degree.
Yeah, pretty much... I mean, I've forgotten more about unarmed combat than most will ever learn... I could easily hospitalize just about anyone I meet... but do you think I do? Nope... it's my policy to walk away from fucktards. In fact, I haven't had a physical altercation in the last 15 years that required more than one blow to resolve--I'll take it a step further and say even the handful of blows I have delivered, I deeply regret... because not one of them was truly self defense (in the sense that my ego or temper escalated it to physical confrontation), and on more than one occasion people really got hurt (like broken bones/permanent damage hurt).
If you think it's okay to hurt people for the sake of your ego... you're either immature, or a delusional scumbag.