The Cincinnati Bengals have something to be afraid of, and it probably isn't the St. Louis Rams. Following a field goal by St. Louis, the Bengals set up at their own 26-yard line. After a short gain and then a big loss on the sack, Andy Dalton threw a deep pass to A.J. Green, who fell down and drew the pass interference penalty. It went for 25 yards, but on the replay, it was clear that Green did a small push-off and then simply tripped.
Other than the fact that it led to absolutely nothing for Cincinnati, getting no points out of the drive, Green immediately took to the sidelines with an apparent shoulder injury. On the sidelines, he looked like he was in pain with a grimace or two, and eventually left for the locker room. He landed directly on the shoulder.
According to ESPN's John Clayton, it's a right shoulder injury and his return to the game is questionable. Here's a .gif of the play he was injured on: