My friend is in an abusive relationship. and he's the abuser...?

[waterpolosav]

So one of my friends who I've known for quite some time has been going out with a girl from a different high school for about 6 months now. None of us in our clique have seen her very much, and wondered why he didn't bring her along to more events.\
At a part last night, I walked in to her being pinned up against the wall by him while he rained some pretty horrible verbal threats/insults at her. I lost it completely, and tagged him in the side of the head as hard as I could. He fell like a ton of bricks, and got up all dazed asking what the hell was going on, but I had already his gf clinging to me and I walked out of the house w/ her.
Here's the crazy part, after thanking me, she went ahead and defended his behavior! Then when I talked to him, he said it was none of my business and that he had to "exercise some control" over the relationship. I now know why he keeps her so isolated, and she told me he sometimes slapped her around. should i beat his ass?

[S. Elizabeth]

Yes! I normally don't advocate violence, but in this case, he needs to be put in his place. Then have a good talk with the girlfriend about leaving him.

[Dave C]

You beating his butt will not stop his gf from seeing him. He's obviously a nutter. What's the gf's problem that she takes this abuse?