I think what is being discussed is in all 3 cases the balls are descending. If this batter is in the extreme front of the box and this is where the ball crosses her at that spot in the batters box..we need to picture where they would cross her if she was standing at the plate. Thus "C" would be chest high, "B" might barely catch the knee, and "A" would be shin high. STRIKE,STRIKE,BALL.
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But if she is in the very back of the box then we might say
BALL,STRIKE,STRIKE
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