First of all, we know he's never been a choir boy. Always been a party boy, had arrests for substance-related incidents in the past. Lots of stuff back at FSU, later on drunk driving, the date rape drug thing, another fight/argument/whatever incident here at a Walnut Creek restaurant a few years back. Let's just say he's known in these parts and it's not for his positive community service.
Second, and sorry if I'm painting with a broad brush, but Berkeley chicks are wacko. I was dating one of them earlier this year. They just are. There's a psychology about that town and the women living in it. Again, no offense to anyone, but they just are wacko.
So, bad combination.
With the California unemployment rate second only to Nevada's and the foreclosure mess (in Berkeley big time), it's not hard to imagine she probably is desperate for some coin a year after whatever incident occurred.
I speculate he was hoping to split the uprights and the attempt was blocked by the defense. He didn't like that and got teed off, probably did a little illegal blocking when she tried to run her fly pattern out of there, then kicked her to the curb. Happens all the time in bars and clubs across America when people are imbibing. But because he has some celebrity and some bucks she's looking to cash in.
If he doesn't write her a little check to make this go away, it'll get tossed out by a judge in about 3 seconds. Courtrooms are too full already for this nonsense.