My cat Bellabear (1.5 year old female) suddenly started attacking my cat Atticus (a little under 1 year old male, fixed) The other night we were all sitting in the living room quietly and Bellabear heard Atticus and my other cat Molly play fighting...she immediately perked up and I thought she was going to go watch, which she likes to do. But, instead of watching, she jumped on Atticus and attacked him. It was a full blown fight. Very loud and Atticus got so scared he was howling and peeing. Now, every time they see each other, Bella attacks him. They got along fine before. I have them separated now because if I don't she will attack. Otherwise, she is fine. Loveable with us and with Molly. I put her food and water and litterbox in the backroom. I feel bad because I can hear her whining back there. But, I need to get this issue fixed. My boyfriend is threatening to throw them both outside if they don't stop. And,of course that would be horrible because they are indoor only cats with no experience of the outside. But, they can't continue this fighting either. I ordered some Rescue Remedy in the hopes that it will help things calm down...but I have to wait for it. What should I do in the meantime?