When Sydney is running from the killer on the Stab 3 set she runs from the killer behind her into the set of her house only to have the killer jump out of the closet in front of her.
When she knocks the killer downstairs the killer appears upstairs with her in a body bag.
Is there another killer (this being the only Scream movie with only one killer),or is Sydney hallucinating about the body bag (she's gotten though two movie without losing it),what?