I'm not sure what caused it. I wasn't paying complete attention. I looked over and she was like this. I think its any stage where they can be knocked downward onto another tier.
Interesting. I know there's the glitch where if you end a round by KO'ing with Honoka's PL attack they'll be stuck with it. But I guess it also happens if you get hit by Nyo's 4P+KP ?