I talked to both referees after the game. And it wasn't so much dissagreement as not seeing it. Because the play was off the ball, the near referee didn't see it, he was watching other areas, where the ball was likely to drop. However, he didn't question the far referee who did happen to see what had happened. If however, they had dissagreed, the decision is basically up for grabs, and the one with the more dominant personality is likely to win. I guess whoever is closer is the one who makes the final decision, though I've never run a two man.