More than three decades after he held 10 people hostage for 21 hours at a Virginia high school, James Stevens is on a mission to stop school shootings. In 1982, carrying a high-powered Mossberg hunting rifle, Stevens walked the corridors of Lake Braddock Secondary School, firing off rounds. "I just started shooting," Stevens told Inside Edition. "The kids were running down the hallway. I was shooting from the hip. There's screams and yelling and just total fear."