Chargers running back Mike Tolbert was taken off the field on a stretcher Sunday during the team's disappointing loss to the Bengals. Tolbert took a handoff, put his head down and ran into safety Reggie Nelson's chest in the first quarter on Sunday. He fumbled and remained face-down on the field, motionless, when the play ended. Doctors carefully rolled him over onto a backboard, strapped him down and wheeled him off the field. Tolbert raised his right forearm and gave a thumbs-up to the crowd cheering him.