I know that you must be scared and upset about the fight. Cats pick up on these feelings very quickly and respond to them. So you need to try and take as many deep breaths as possible. I have also found that letting them work it out as long as there isn't any blood is the best thing. *sigh* Ok that doesn't sound right either. I don't really know what to say. You have to play it by ear. Watch the cats and try reintroducing them slowly. Good luck and I hope your happy home comes back quickly.