Flight 93 On The Ground

"To be more specific, if something doesn't look right, it probably isn't and you should report your concerns to the authorities. If someone seems irrational, delusional or just plain weird, let someone know. If someone seems to believe you have a romantic relationship and you don't - be alert and report stalking or obsessive behavior as soon as you encounter it. Sometimes, if these situations are caught early, the subject can be helped with medical intervention. Do not put embarrassment above safety.

Most importantly, if you find yourself in an active shooter situation and you can access real shelter or cover, waste no time running full speed in that direction. If you are trapped, in a room with an assailant who is picking off victims as he/she finds them, FIGHT. Throw things, big things if you can grab them. Use that as a distraction to assault the shooter. Go down fighting if you must, but do not let yourself be immobilized by fear. Unless you can hide among the bodies and successfully play dead (a risky tactic if the assailant decides on a 'coup de grace' shot), you may as well go down fighting. If you cower in a corner or under a desk, as soon as he sees you he will kill you. Take the initiative away. You have nothing to lose in this situation. Remember the lesson of 9/11, submission to an adversary bent on killing plays into his expectations and will likely result in your death."

UPDATE: "It is a poor reflection on us that, in those first critical seconds where one has to make a decision, only an elderly Holocaust survivor, Professor Librescu, understood instinctively the obligation to act."