If, (while the infield fly rule is in effect), the ball is caught, the runners must tag up. If the ball is dropped or falls to the ground untouched, the runners may advance at their own risk.
Clarification:
The infield fly rule was enacted to prevent teams from getting an easy double or triple play by letting a popup in the infield drop. An infield fly is just like any other fly ball, with the exception that the batter is immediately out, with results in the runners not being required to advance in the even that the ball is not caught
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