"The first thing I encourage students to do is to run"
No, beat his loving ass. I'm not sure if this was a high school or not but less people could have been injured with a well placed chair to the face. They always encourage people to run and hide, seemingly forgetting that if the person has a gun, or the person is actually looking for students, hiding and running does nothing. Their are at least hundreds of students and one attacker. The guy can't can't all of you and its better then hiding in a room waiting for the guy to come in and get you.
Also, I'm happy this one didn't get the chance to kill himself. Now he can actually receive the punishment he deserves.