How dirty? With 22 seconds left in the game, the Steelers' star wide receiver, Antonio Brown, was mid air, ready to catch a ball that he hoped would put the Steelers within range of a game-winning field goal. Instead, Bengals' linebacker Vontaze Burfict launched himself at Brown as he came down, slamming his helmet (which in the NFL can weighs four to six pounds) into the side of Brown's head, whipping it sideways on his brain stem. The hit, at an estimated 707 miles per hour, carried about 1600 pounds of tackling force. It flattened Brown on his back, seemingly knocking him unconscious. Jim Nantz, the NFL's normally unflappable play-by-play guy, was apoplectic, calling the assault "disgraceful."