Supposedly he saw a couple arguing and intervened and him and his friend beat the shit out of the guy according to one source 'half to death'. Then fled the state.
I covered the rumor a few posts up. Jordan Breen talked about it on his show and then there's a thread on Sherdog with a bit more info
But I agree with what you said about Dana. Not something he should be making public statements about until the whole story comes out.
Obviously it's not beating a woman, but it's still not OK. You see someone doing something wrong, you call the police and detain that person until they get there. If the cops had done what he supposedly did they'd be nailed for police brutality.