Proper mirroring on a three-pointer...

[Freddy]

Originally Posted by AremRed

Making the mistake is a bigger deal than correcting it for sure . . .

Agree. Making this mistake IS a big deal, for it slices straight across the artery that pumps blood into the very heart of the three-person system. (The two-person system, too, but that's not the OP)
For any newer officials -- or vets, for that matter -- who don't consider two arms in the air on a three-point attempt that big a deal, here's an article that includes important concepts you should include in future pre-game conferences with partners.
https://docs.google.com/viewer?a=v&p...Tc4MWM0ZmU4OGY
Ballwatching is the scourge of the three-man system. Fight the habit in yourself and endeaor to peer-coach it out of everyone you work with.