Its not just the challenge and the bunker call it was also the time keeping

[tiger magpie]

Go back and watch the way the clock runs down, then runs up again and then is adjusted to one second.

The game was over before the restart!

 

[innsaneink]

Broadcasters clock is irrelevant

 

[nrlsurvivor]

Broadcasters clock is irrelevant

I think they are linked to the click at the ground. Both the nine and fox clocks did the same thing.