[D9u]

From the above link: Students were not notified of the situation until after an hour after the initial tip.

It seems as if the powers that be decided student safety was less important than apprehending any possible suspect...

[akiselev]

Human reactions under dangers like this are extremely unpredictable. I mean, who has ever really had a chance to test the effectiveness or wisdom of their fight or flight response?

If there is a gunman I think you would want students spread out among their classrooms. If there's a major panic there can be deaths from the panic not to mention the danger of a gunman in a hallway as students try to escape.

[lwf]

I mean, there was a delay in sending out an alert, but you most certainly couldn't get very far if you tried to walk into the main group that morning.