Report them for assult!! Violence towards anyone no matter what their sex isn't acceptable. I would hope the man unless having to defend himself would walk away and not retaliate.
She has no excuse for hitting him, if he reported her to the police it would be no more than what she deserves. Sadly it may mean now that when a woman (or man) is in real need of help he may walk on by after this experience and all because she was drunk!
It really depends on how much further he wants to take it himself but just because it was a woman that hit him should not mean that he doesn't take it any further. As wingnut rightly says unfortunately he may not be so quick to help next time. People should earn respect by their actions not just get it because we are 'the fairer sex'. That's todays world
It took place in his house but there are two witnesses to her being drunk and one to her mother saying that they usually sort these things out but she ran crying to her neighbour who rang the police.