Sub request during serve

[IK13]

Originally Posted by Scrapper1

The reason I did it this way is because during my women's season, I had a situation as R1 where I beckoned for serve and then the server went to sub out. My R2 tried to wave her back, but they didn't get it. They just didn't understand what was happening. I ended up calling an 8-second violation. My mentor said that, as an assignor, he would prefer me to call the delay warning and not gift a free point to the opponent.

So...whistle for serve, player who is supposed serve instead of doing so goes to get subbed. That's it? What delay can you give here without a whistled sub request? For that matter, is it legal at all for the R2 to whistle at this point anyways?