I watched the replay on NFLN of the first couple series in the game. I remember watching it live and Vinob****'s mic didnt work for the entire first half...well in the replay they seemed to have the audio from Carter's DPI. He says "Pass Interference, CUTOFF on the defense".
I guess now corners arent allowed to defend a spot on the field that the receiver is running to. If a DB is standing or running to a spot and the receiver is running to the same spot, the DB has to get out of the way and let the WR run by otherwise it is a "cutoff" penalty.
But if a DB grabs the receiver's arms not allowing the receiver to reach up to catch the ball and causes the ball to deflect up into the air for a pick-6, that is A-OK.