Check Swing - Ball

If the home plate umpire grants a check swing appeal, and the base umpire thinks that the batter did not, in fact, swing, they will uphold the original call of a non-swing, ball. They will do so by spreading their arms apart, with their palms down (similar to calling a runner safe in other contexts). The base umpire’s judgment is final, so now a ball is added to the count.