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The way I understand it:
If 1 second or less elapses from the time of the whistle, leave it alone.
If more than 1 second elapses, set it back to the time you saw.
Example: 3.2 on the clock when the whistle blows. Clock operator stops clock at 2.3. Leave it alone. Clock stops at 2.1, put it back to 3.2.
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