On an island

[DTQ_Blue]

Mark, There are other plays I call based on sound. Catcher's obstruction, I don't see the glove hit the bat, I hear it. Batter HBP when the ball only grazes the uniform. I've actually called that one once or twice. I don't see any difference, provided your brain, which is processing what you see and hear, tells you that the timing between the sound and the glove moving past the arm is exactly the same.