If you are missing it you will hear things like: "NOOOOO! TOO LOW BLUE!"...or my favorite..."Get your nine-iron guys".
I watch for the ball to pass through the zone. Also, I've learned that the catcher can blow it by dropping, turning, or sweeping his mitt. Generally speaking though...he is doing that because the ball is down. If he wants the low one he's gotta stick it at the knees.
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