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The logic is to keep an umpire ahead of the runner. On a cleanly hit triple you can be at 3B to make a safe/out call while you still have a partner ahead of you at the next base in the event of a subsequent play there.
If you release the lone runner after 2B and there is an overthrow at 3B and the runner goes home, the PU will end up chasing the runner back to the plate.
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