Well in these case the students were apparently sleeping when each was attacked, and some were drunk. So I don't think the gun was necessary.How did the killer subdue and stab 4 people? I was just studying other such cases. When Richard Speck killed 8 nurses with a knife, he had a pistol. While he did not use it, he apparently used it to control the victims while he took each from the room and killed them with a knife. Makes me wonder if the Moscow killer had a firearm that he did not use in addition to the knife.