Halftime thoughts: Bills battered, bruised

The Buffalo Bills trail the Washington Redskins 20-7 at halftime of Saturday's preseason contest, but the game's first half has been defined by injuries.

Quarterback Kevin Kolb left the game in the first quarter with concussion-like symptoms and will not return, the team announced. Kolb had a chance to gain lost ground in the quarterback competition with EJ Manuel sitting out the rest of the preseason with an injury, but those plans were derailed by Kolb's head injury.

Undrafted rookie Jeff Tuel has been at the helm since Kolb departed. He's all the Bills have left at the position, so there's a feeling of Buffalo being on their heels for the remainder of this game. Even so, it's a prime opportunity for Tuel, who saw little action in last Friday's preseason game.

Meanwhile, running back C.J. Spiller gave the Bills their first injury scare of the game, grabbing for his right knee after a touchdown run in the first quarter. Spiller was initially limping, but he later returned to the game. ESPN NFL Insider Adam Schefter reports that Spiller simply cut his knee after being spiked.

In addition, cornerback Stephon Gilmore (hand) and safety Da'Norris Searcy (head) both left for the locker room for injury evaluation late in the first half.

The injuries have overshadowed what has been a rough outing for the Bills defense. The Redskins have gained 96 yards rushing in the first half, while quarterback Rex Grossman went 8-for-14 for 144 yards and a touchdown before handing the offense over to Pat White, who added a 14-yard touchdown run.

Bills wide receiver Steve Johnson, who is making his preseason debut after missing the first two games with a hamstring injury, lost a fumble early in the second quarter.