They can spot a guy 40 yards away racing down the field supposedly tugging on a guys jersey as he runs out for a pass and it's holding.
But... they can't see the QB they're supposed to be protecting has his head turned completely sideways by a DLman who has a firm grip on his facemasek that everyone BUT the official sees? That was game altering as it would have likely ended in a Rams TD instead of a FG. And it could have ended in a serious injury. Doesn't make me have much faith in these refs, sometimes. That's the equivalent of a WR dropping a wide open pass for a TD.
Thank that would have been missed if it was Tom Brady? These refs know who to protect.