I hate to see anyone interfere in an otherwise even girl fight.
But I have to honestly say, I don't know how I would react if I saw my wife or my daughter in a catfight. I know guys are quick to say how much they enjoy seeing their wives or girlfriends fighting, but I think it depends on how the fight happened, and what was happening.
If my wife and another woman had a disagreement and wanted to meet to fight, I would stay out of it unless one of them was getting hurt. And obviously, if my wife and another woman agreed to a rules catfight, I wouldn't interfere either. But if my wife and I were out somewhere, and another woman attacked my wife, I would probably try to stop if unless my wife told me to stay out of it.
I've always thought that if two girls or women want to fight, then they should be allowed to fight it out without interference. Just my 2-cents worth.