That interested me, so I went back to check. Sure enough, when she does her "split", the Kanade that propels towards the fish had red eyes. Though, I never realized that they actually split during that time, I figured it was her "Delay" Guard Skill; the one she used when fighting Yuri in episode 2.
But if she did split, she did it after she said "Must save them"; meaning her intentions were to save her new "friends". I definitely think it was Yuri that provoked split-Kanade to rape her.