A Hollywood caricature of martial arts might be useless. But my understanding of some martial arts is that they emphasize keeping a cool head, awareness of surr

A Hollywood caricature of martial arts might be useless. But my understanding of some martial arts is that they emphasize keeping a cool head, awareness of surroundings, deescalation and evasion over violent confrontation. Being even somewhat competent in those skills could prove valuable in an active shooter situation.