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Any gunshot would at a school probably includes a very different pattern of behavior. If someone wants to murder (or maim) a specific person, or small group of people, they may carry that out with a gun, because it's expedient, but might switch to a knife if guns aren't available. If someone wants to murder (or maim) a large number of people, guns or explosives are really the only practical means; mass knifings have happened, but are even more rare than mass shootings.