I was worried too, the only hope I have is I doubt they would have sent him back out had it been even a mild separation (though would they have known that quick?). I would assume after he was in some pain trying to throw on the sideline, he went and got a shot in the locker room. Just hope it is as minor as possible though. Those injuries tend to linger, and if it is weakened, it will lead to more bad stuff if/when he lands on it again.