Jake Locker left Sunday's Week 4 game against the Texans in the first quarter with a left shoulder injury. Texans S Glover Quin blitzed off the edge and was unblocked on Locker's blind side. Locker was left squirming in pain on the field and was quickly escorted to the locker room for testing. He couldn't move his left arm -- the same side he slightly separated his shoulder in during Week 1 this season. It may have popped out again. Matt Hasselbeck has come on in relief.