You don't balk him for taking signs off the rubber. You balk him for NOT taking signs from ON the rubber. Once he toes the rubber, THEN he must take signs. If he doesn't, it's a balk. The idea here is to prevent quick-pitching.
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"Many baseball fans look upon an umpire as a sort of necessary evil to the luxury of baseball, like the odor that follows an automobile." - Hall of Fame Pitcher Christy Mathewson
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