Security expert Bill Stanton demonstrates to INSIDE EDITION what to do if you're in the middle of a school shooting.
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.
Read: Roseburg Community Reels After College Shooting: 'The Heartache is Just Beginning'
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.
Read: Oregon Shooter's Dad Speaks Out: 'It's Been a Devastating Day for Me and My Family'
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.”
Watch Below: Witnesses Say Oregon College Gunman Asked Students Their Religions
