The most important lesson students ever learn in class may be how to survive a campus shooting.
Sadly, it's something every student has to think about in the tragic aftermath of the Umpqua Community College massacre in Oregon.
Security expert Bill Stanton told INSIDE EDITION that using furniture to make a barricade can keep a gunman out of a classroom.
The Los Angeles County Sheriff's Department recently produced a graphic training video of a shooting on a college campus - along with tips on how to survive.
“Use cover, something that will stop a bullet and concealment, something that will at least keep you out of sight!” said the video.
Stanton added that if there is a chance to escape - take it. Running in a zig-zag pattern also makes you a difficult target to hit.
But what if the gunman gets into the classroom - as Chris Harper Mercer did? This is the worst-case scenario because you're in an enclosed area.
Our security expert said to use every available weapon – bags, furniture and even fists to overpower the gunman.
“It really does need to be a group effort. I can either run to the back of the class and be a target, or I can fight for my life,” he said. “And the more people engaged in that fight, the better chance everyone has to survive.”