Arik Armstead ends Seahawks 1st drive with sack

WATCH: Arik Armstead ends Seattle’s 1st drive with a sack.

The 49ers defense allowed nine yards on the Seahawks first play from scrimmage. A stop for a loss by 49ers DL Javon Kinlaw on second down put Seattle in a third-and-2. On third down, defensive linemen Nick Bosa and Arik Armstead went to work on the left side and it was Armstead he fought through for a drive-ending sack.