One really has to be extraordinarily level-headed to be able handle the RUN, HIDE, FIGHT course of action recommended when confronted by an active shooter.  Active shooters tend to be highly stressed individuals who are obsessed with personal vendetta’s. They become inspired to act on their obsession when they hear of another active shooting incident. Ready.Gov offers many links for further reading on this subject for those in fields at higher risk for active shooters such as the health industry.