on arming teachers - whatever the method - ie ccw so on the hip, locked in a box somewhere, whatever

what kind of gun? handgun? ar-15? shotgun? probably handgun id guess

bad guy sneaks into school with an ar-15 and starts shooting. now thanks to the video from last week we know what that sounds like

these teachers will have had a basic gun safety course
they might even have had some sort of “here’s what you do if” training
it will not be police, swat or army training (sir)
recurrent? who knows

they will likely not be trained under hostile ‘enemy’ fire pointed at them
these people will not be heroes

no one with whatever training these teachers have is going to run towards that.