[quote=Flamelord]
I could see that. Probably was a colleague rather than the aggressor there, and she sees Summer's death as the fault of Vale/Beacon/Ozpin for whatever reason, so she's trying to bring down the 'corrupt' system. Or something like that.
[/quote]

He did mention to Ruby that he's made more mistakes than any man, woman or child in Vale. Perhaps he had purpose in saying that to her in particular, as he felt guilty about the death of her mother which he was directly involved in. An event which disillusioned Cinder.