Top of the Sixth: Oakland vs. Boston

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Did anyone else wonder why the plate umpire didn't call the A's Eric Byrnes for interference when he shoved the catcher, after he had missed the plate and the catcher was trying to get to the ball? Shouldn't that have been an immediate dead ball? Eventually Boston got the out by tagging Byrnes, but it seems that he should have been called out when he pushed the catcher who was going for the ball.