chunk: Helen, who is curious about Mark's films, finally runs one of them. She becomes visibly upset and then frightened when he catches her. Mark reveals that he makes the movies so that he can capture the fear of his victims. He has mounted a round mirror atop his camera, so that he can capture the reactions of his victims as they see their impending deaths. He points the tripod's knife towards Helen's throat, but refuses to kill her.
  The police arrive and Mark realises he is cornered. As he had planned from the very beginning, he impales himself on the knife with the camera running, providing the finale for his documentary. The last shot shows Helen crying over Mark's dead body as the police enter the room.