The reason for the whistle also serves the purpose to the players to stop. It decreases the chances for something to occur after the period has ended. And once a try is in the air and is obviously going to be unsuccessful and the horn has sounded [or light has flashed if that is being used], a whistle from the official responsible for the last shot will help define what occurred when.
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Never hit a piņata if you see hornets flying out of it.
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