American Football NCAA Approved Ruling 3-3-6-VIII and IX

VIII. Late in the half ball carrier A35 is tackled. B79 goes to the ground with an injury and the officials stop the game clock, which shows (a) 12 seconds; (b) eight seconds. RULING: Team A has the option of a 10-second runoff. If there is no 10-second runoff the game clock starts on the snap. If Team A accepts the option, (a) there will be two seconds on the game clock which will start on the referee’s signal; (b) time in the half has expired.
IX. Late in the half ball carrier A35 is tackled beyond the line to gain. B79 goes to the ground with an injury. RULING: There is no option for a 10-second runoff because the game clock stops on the first down as well as the injury. The game clock starts on the referee’s signal.