Another way is to throw a towel over one or both of the cats (separate towels) so they can't see each other and become more focused on getting the towel off than the fight. Keeps your hands out of harms way and the towel will help protect the cats from each others claws until you can separate them.
I plan to move in with my boyfriend, but the issue is, I'm worried for my cat. Loki,
He is a year and a bit now born in mid August of 2014. I keep him as an indoor cat, but will let him play in the back yard and field (we have a school behind our house, and the field gets full of dragonflies...