Bo rescued her and while filming location scenes at Duke University, Sarah realized Neil was indeed the killer, so Neil stopped Sarah from escaping and chloroformed her as she cried out for Bo. He then dragged her to the University clock tower where he held Sarah captive.
Bo rescued her during a filming scene at Duke University; while doing so, Sarah realized that Neil was the perpetrator. As a result, Neil stopped her escape and used chloroform on her when she cried out for Bo. He then took her to the university clock tower where he confined her.