It looks pretty bad.
Sounds like he's been trying to get her out of his life for quite some time, and she's made it impossible...won't move out, won't return his stuff. I think he's sent people before to try to get his stuff.
It sure sounds like he just got fed up with it, and just sent someone over to beat it out of her.
I will say this, there is a very small but non-zero chance that this is some kind of ploy...this sounds like one crazy relationship/situation, with a woman doing everything possible to avoid giving up this lifestyle. The timing is a little weird, as I understand there was a legal proceeding scheduled just that day to try to get her out legally...that seems like pretty ridiculous timing the day before a court hearing to decide to do it the pistol-whipping way instead. So I'll just slightly reserve about 5% of my judgement until all the facts come out. But it's probably exactly what it looks like.
I also think that what may have happened was he once again sent someone over to try to get his stuff, and maybe even intimidate her, and the situation got out of hand and she got beat down by an overzealous musclehead. He may never have meant for her to be beaten like that, but nonetheless if that's what happened he's still totally responsible and needs to pay the price.