Two comments. There are veterans in almost every class in every college. Much prefer them to be armed than liberal pooftah professors. Secondly, adult students should be taught to rush the shooter if backed into a corner and evacuate the premises quickly if not cornered. There is no way this guy could have killed all those people had he been bull rushed.
That is one thing I did not understand well... why no attempt to leap on the shooter. Someone might have yet gotten shot but then that could have quickly been the end of it as the shooter could not shoot everywhere. This is a good example of sacrifice for good, which Christian faith is supposed to exemplify to a T.