[lugerholsterrepair]

Matt..Having been at war for two years in my youth I can tell you it is difficult to get even a trained Soldier to charge live fire. In the confines of a small classroom, once the shooter is in the door, all cooperation for a mass assault falls away in confusion as the shooter finds and shoots the first target. The confusion and noise plus the shock of the appearance of a killer in your face will cause all but the bravest to fall back.
There are only few opportunities during an assult..reloading and if he were to try and breech a doorway that is closed. If he were to stick a hand through a door his arm could be broken by a chair or other heavy object.
Remember these students are mere children. The mature adults on flight 93 had age and time. Once they discovered they had nothing to lose they parleyed and came up with a plan, then executed it.
These Virginia Tech students were overwhelmed with deadly force quickly. An ambush so to speak.The few who had some time did block doors or escaped thru windows.
In many instances of large groups guarded by a few with weapons it would seem reasonable to overpower their guards. Look at how many Jews were assembled and killed by just a few.
The Battan death March. Dozens more...Hard to say what any of us might do given these circumstances. Like you I pray for courage should I need it. Jerry Burney