and on a totally different note... after the Columbine, Colorado school shootings, a fellow USPSA shooter and High School Principal and I were discussing the prospect of arming teachers...what we did decide on was an optimum platform for most likely non shooting staff, and limited formal training.... a 16" lever action carbine (Marlin side eject) in .357 mag (.38spl dependent on shooter) with a reflex sight that was fiber optic lit or etched reticle ( today I would choose the Vortrex Spitfire with the reticle etched on the prism)
it is intuitive to put into action, accurate at realistic distances, adequate stopping power.... a non intimidating recoil or muzzle blast