"Countdown" allowed or not?

[M&M Guy]

Just a thought, but since there was only one scoreboard on one end of the gym, why wouldn't the clock operator do this anyway, and for both teams at the end of each period?

I do agree it's technically not the book keeper's responsibility, but perhaps they had set up that arrangement at the table because the book person has the louder voice?

Just thinking out loud. (Well, as loud as my keyboard gets.)