These guys are usually packing heavy and spraying bullets.
But #### it, better a few teachers dying than 2 dozen kids when some nut busts in.
With our educational system’s teachers, it might be a bonus lol
Read the history of the "Texas Tower" incident at Texas A&M. The shooter was a former Marine, but bullets coming from armed civilians forced him to keep his head down and much slowed his fire rate (this was long before all the CCW, citizen gun ban).
An amateur teen shooter would likely be forced to stop shooting altogether.