After the crash, Ben and Steve are trapped in a car severly injured. When the medics get to the scene, Ric realises that Steves leg is too damaged to save and they can't get to Ben because Steve is in the way. So Ric deides that Steve needs an amputation. When they get Steve out they can get to Ben but when they get Ben out, they discover that he is too badly injured to save and he dies. (thetvdb.com)