The initial hour after releasing my sorority girls was nothing short of terrifying. Long story short, Tinkerbell and Rue beat the crap out of each other. There continued to be more aggression among groups of three or four, but they began getting broken up by my yellow giant, Dorothy! I released her last and ten minutes after everyone on the schedule because she is pretty aggressive and enormous, but I haven't seen her nip anyone, just swim between two opponents until they back away.
I never realized it would be this fun to watch, it's like a nature show! haha