the refs just swallow the whistle at the end of a game and let them play. That's part of the strategy with an aggressive defense. It is a calculated risk that the refs won't call it at a critical juncture. Frankly, it puts an offense in an unfair situation because the QB needs to get rid of the ball quickly and at first glance, Phillips isn't open. He would have been had the defender not been grabbing and using the forearm across the neck to keep him from pulling away. This is the angle Trevor Matich saw when he stated it was a clear hold.