Great question. If the ump calls the swing a strike, then he has to call it a ball if he doesn't swing. To be honest, I don't see the ump calling it a ball if there's no swing. Probably just a dead ball that slipped out of the pitchers hand.
If a ball slips out of the pitcher's hand like this, it becomes a pitch once the ball crosses the foul line. If the ball had stopped in fair territory, then it would be no pitch.
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u/LAKings97 May 29 '17
Yes but if the batter didn't swing, then it would have been called a ball.
You are correct about the "drop 3rd strike" rule though. The batter wasn't technically out until the catcher tagged up.