NW vs. Bama and Plate Umpire!

[benbret]

I have always been told that if an umpire calls the ball foul then it is foul no matter where it goes. It was clear that the third base umpire called this ball foul. How can they keep playing? Is there a case book play that covers this situation. What if the plate umpire had called it foul and the third base umpire called it fair. Would we just play on? It clearly would put one team at a disadvatage.