Her life. i think if you had the chance to ask her would she do it again, the answer would be yes. the covenant school employees follow this key training, says fiddler. first thing to do is make sure the doors are locked, get the window covered, and get the kids out of the line of fire. reporter: fiddler says the shooter fired through the locked doors of several classrooms, but nobody inside was hurt. the children were out of the line of fire. other important lessons, being vigilant about visitors carrying backpacks. the amount of crap you can fit in a backpack is alarming. the first one being this guy. reporter: also in this relatively small backpack, fiddler has a bunch of 30 round magazines and three block pistols. the training emphasizes not being a sitting duck if a shooter is about to enter a classroom door. fiddler demonstrates a potential scenario with a fellow trainer.