School Lockdown drills
Interesting the first defense (and natural response I think) is to get away, yet in all the schools I've worked in the first directive is to hide and stay silent. Many of my coworkers get all worked up on this esp in the special needs class I most often work. These kids have a hard time being silent, standing still etc. Bottom line I say to them do the best you can to follow the drill and admins guidelines but in the 1 in 1 million chance it were ever real. The teacher is in charge in the classroom and they decide what best to do to keep their kids safe.