Redskins QB Robert Griffin III helped off field in 4th quarter against Ravens

Washington quarterback Robert Griffin III has left the game against the Baltimore Ravens in the fourth quarter with what the Redskins say is a right knee injury.

The rookie was helped off the field after being sacked, returned briefly, then dropped to the turf and left again.

While he was being worked on by trainers on the sideline, Redskins backup quarterback Kirk Cousins entered and threw an 11-yard touchdown pass to Pierre Garcon with 29 seconds left. Cousins then ran in a 2-point conversion to tie the score 28-28.