Game yesterday, pitcher on mound, nobody on base, pitcher starts windup, cleat catches on pitchers plate and so then stops pitching motion to start over. Umpire calls "ball" and pitcher is charged with a ball. Umpire says he stepped off with the wrong foot in disengaging the rubber (he actually stumbled a slight bit coming off the rubber). So whether he is charged with a ball for this or stopping his pitching motion after he has started is up in the air, but more importantly I can't see it as either an "illegal pitch" or a "balk" because no runners were on base. We play by MLB rules but I could not find in the official rules where this is called a "ball". Any help would be appreciated.
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