HUNTSVILLE -- When Jon Brasher shut his thumb in a car door, he shrugged off the injury and continued in to work as a ranch hand in Morgan. That decision, it turns out, almost cost him his life. The sudden pain the 17-year-old Huntsville teen felt in his thumb that August day left him feeling light-headed, but he didn't let it stop him from working. It was the day before his junior year was to begin at Weber High School, and he had spent the summer working hard to save up for college.Jon and his boss, Dave Fluckiger, went into a barn and up to the loft to get a post pounder for the miles of fencing they were replacing."I don't remember what happened next, but Dave told me one minute he was talking to me and the next I had crumpled to the floor and then fell down 10 wooden stairs," Jon said. "I was knocked unconscious for a few minutes and had stopped breathing."