[Sharon is trying not to make it glaringly obvious that she is out of her depth. (Or perhaps she is just hiding how bizarre her own world is, since why would she know such a thing? It is a mystery.)]

I suppose that is one way to guarantee attendance. Though I must admit, it seems rather odd to put in the effort for a mass kidnapping only to kill the students later.

[Not to say she hasn't been part of kidnappings specifically for murder, but that was on an individual basis and had a more concrete goal.]