Case Keenum suffered a violent hit on his head after a passing play in which he suffered a concussion.

But the game was not stopped as the NFL injury spotter let him stay in the game, as did the St. Louis Rams.

Keenum took another sack two plays later and fumbled the ball away to the Ravens.

Jeff Fisher broke down the play for reporters and didn't mention Keenum's head and no reporters asked.

The NFL has said it will investigate why Keenum wasn't immediately removed the field and examined.