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What organization?
In NCAA, it's a different technique depending on what ends the time-out. If as the R2, you end the time-out with your whistle, it's not mandated that you have to whistle the sub. If you see them, you can authorize them.
If the horn ends the time-out, you blow your whistle to indicate the substitution. It's nice to usually blow your whistle to indicate the substitution regardless of what ends the time-out for the sake of good communication with your partner. In addition, it notifies your scorekeeper that there's an incoming/outgoing substitution. I always tell my scorekeeper to listen for my double whistle. That's their cue to look up for the sub as I won't vocally tell them who's coming in/out (that's what the Asst. Scorekeeper is for).
So, in NCAA, and the way I do it, my process would look like this:
- Signal the end of time out with the whistle (Tweet Tweeeeet)
- Indicate number of time-outs to the R1
- Authorize the sub on my right (Tweet Tweet) while doing sub signal
- After sub is complete, look left, look right, give the court back.
Hope that helps!
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