"I Was Going to Shoot My Teacher" - he carefully planned for campus carnage. Then he went home. What happened?

“Al” was standing less that 50 feet away from the teacher he hated. Al had a shotgun in his backpack, and he had a plan. He had schemed for days on storming the office and killing this instructor. What led to Al’s plan, and how did it end? A rare interview with a school shooter who changed his mind and went home.