Mark --
You need to read the comment after case 5.10.1B.
Note that in that case, the referee noticed the clock *after* he blew the whistle. This is the same as the 1 second lag time.
In the other case (5.10.1D), the referee noticed the clock *while* blowing the whistle. There has been no lag time yet, so it needs to be allowed for.
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