Lock-down

When it comes to terrorist activity, it seems the country is always reacting instead of pro-acting. The recent shooting in Florida illustrates the point. In the high schools where I go the doors to the classrooms are kept closed and locked. The idea being that in an emergency you may not have time to lock the door. Lock-down drills are a regular part of the training. At no time did anyone ever explain what to do when you are in lock down and the fire alarm goes off. My guess is, that until now no one ever thought about it.