Clock running out

[just another ref]

Originally Posted by Nevadaref

The rules require the referee to have definite knowledge of any timing error to correct it. The rules book states that an official's count may be used for the correction. So if the clock isn't running when it should be and this needs to be corrected, what are you going to use other than a count to fix it? You can't just make something up or think numbers in your head because the RULES don't allow that.

So counting in your head would not qualify as definite knowledge but a visible count would?