India, Oct. 11 -- A concerning incident involving UNC defensive back Kaleb Cost occurred during Saturday's matchup against the Pittsburgh Panthers.

Cost slammed into the concrete wall behind the end zone, which appeared to have minimal padding, and stayed down after the collision. The severity of the impact quickly sparked concern about his condition.

Cost was able to walk off the field without assistance, though he appeared to be in considerable pain.

The ESPN broadcast chose not to show a replay of the incident, describing the injury as particularly difficult to watch.

The UNC defensive back appeared to hit the wall with both arms before his head jolted forward from the force of the collision. He then seemingly tossed his helmet awa...