Baltimore Ravens running back Buck Allen got his first shot to fill in for Lorenzo Taliaferro this week. Allen is now the primary backup in Baltimore while Taliaferro is out with a knee injury. With his first opportunity, he fumbled on the goal line and his head coach John Harbaugh is clearly frustrated. "You have to hold on to the football," Harbaugh said. "It's just not possible to put runners out there that fumble the football. He's going to have other opportunities and chances going forward, and I really believe he's going to be a very good player.