Cinder - assuming that's who it was; I don't know her voice well enough to tell - wasn't trying to turn anyone against Atlas, the academies, or the Hunters and Huntresses. She was scaring people into turning against them.

[Weiss takes a few steps back, instinctively wrapping her arms around herself.]

Someone had to have known, whether it was Ironwood, Ozpin, someone else entirely. I know that it's entirely too much to ask for a warning before the peace of the world shatters, but if someone knew, I would have loved a hint.