Why did N'Keal Harry's touchdown not count for Patriots? Referee Jerome Boger explain

The two most significant calls nullified what should have been Patriots touchdowns, both in the second half. With the Patriots trailing 23-13 early in the fourth quarter, the rookie wideout caught a Tom Brady pass, broke a couple of tackles and leaped toward the pylon. Referee Jerome Bogar tried to explain to pool reporter Mike Reiss after the game.