To those who say they would have broken that up... Have you ever gotten yourself between two fighting animals(women) like that? Telling ya... You almost wish for anything but that to happen when you work security as they will fuck you up.
So enter knowing you will get bruised, scratched, bitten, clothes fucked up/torn appart and maybe even be inolved in a law suit.
Don't do it. Nobody's life was at danger, it's not worth it. Hell of a come back from the other chick though.