As a former clock operator...
When you get down to the end of the game and it is crazy in there, and I'm sitting floor level looking through 10 players, it is quite possible that I could neither hear your whistle or see your point. Especially if its in the nearside corner in front of a bench. But I will see a hand that comes up open above everyone's head.
Typical out of bounds at any point of the game, especially when its obvious the ball is out of play, what's the point? But I wouldn't say its totally unnecessary 100% of the time.
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