Anytime there is a dead ball and possession is unknown. For instance, say that you are going to allow a team two free throws when it should have been a 1-and-1. The shooter misses the first shot and you, the lead official, retreive it and are about to give it to the shooter when you realize that it should only be a 1-and-1 situation.
You have the ball in your hand and no one has possession -- gotta go to the arrow.
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