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Well it is not done just for the clock operator. It is done for yourself to slow you down. It is done if it is seen on video and sound cannot be easily heard, it gives a reference to when you stopped the clock when sound is not easily heard. And these are the reason the NCAAM have made this an emphasis in their mechanics.
I think it is mostly an essential mechanic unless you are using a PTS of some kind.
Peace
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Let us get into "Good Trouble."
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Charles Michael “Mick” Chambers (1947-2010)
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