It could be something like a memory. I saw... something like a ghost earlier. [ Once upon a Persona 3.... ] Perhaps it could be something that's happened before, or it could be the reenactment of a past sacrifice. Or it could be a past sacrifice doing something.

[ There are a few options, and none seem more likely than the rest to her at the moment. ]

It makes me wonder how many rituals have occurred.

[ Needless to say, there's enough to point towards not enough people being saved. ]