The Buffalo Bills quarterback's head bounces off the turf

Allen was knocked to the ground by his legs and his head bounced off the turf after throwing an incomplete pass in the fourth quarter.

Allen remained on his side, rolled onto his back and was attended to by medical staff. He pointed to his chest and went into the medical tent with trainers and a neurotrauma consultant to be examined.

The Bills' defense recovered a strip sack on CJ Stroud at the Texans' 15-yard line while Allen was being watched. Backup quarterback Mitchell Trubisky came into the game for one play and handed the ball to James Cook for no gain. Allen came back out of the tent, put on his helmet and went back into the game. He threw two incompletions and Tyler Bass hit a 33-yard field goal to tie the game with 3:18 left in the fourth quarter.