Former University of Pittsburgh and NFL Hall of Fame running back Tony Dorsett stands on the sideline before the start of an NCAA football game between Pittsburgh and Notre Dame on Saturday, Nov. 9, 2013, in Pittsburgh. (AP Photo/Keith Srakocic) by Steve Almasy and Eliott C. McLaughlin (CNN) — Tony Dorsett recalls a 1984 game against the Philadelphia Eagles when he was streaking up the field and an opposing player slammed into him. One helmet plowed into another. Dorsett’s head snapped back, his helmet was knocked askew. “He blew me up,” Dorsett told CNN’s Wolf Blitzer. “I don’t remember the second half of that game, but I do remember that hit.” Dorsett compared the hit to a freight train hitting a Volkswagen.