It would appear that at least 5 Deputies were on scene with guns and body armor. Hiding behind their cars while unarmed Cadets inside the school took action to save lives. Some of them giving their lives in the process.

Another thing this shows, is how cops really act when they are "In fear of their life" they run and hide. Tell me if you think the cops in this video are afraid for their lives. Especially that last Shot Gun Blast at Point Blank range, after he was already shot and on the ground.

They had their guns out when they were driving. Only thing he did was fail to pull over immediately. As a former Ambulance Driver, I can tell you, for whatever reason sometimes people don't see or hear red lights and sirens.
These cops seem to be suffering from Road Rage. He didn't pull over fast enough, that pissed them off and out came the guns.