Terrified kids scramble for cover as inexplicable violence breaks out in a classroom. A student’s video captured the sound of gunshots ringing out down the hall. A teacher at the Arlington, Texas, school posted a photo of his classroom door barricaded with a bookshelf and desks. It all reportedly started when a fight broke out between students at Timberview High School. Four people were injured, and the armed student fled school grounds in a car, but was apprehended shortly after.