3-point shot mechanic

[mbyron]

NFHS rules (not that it matters), 2-whistle mechanics.

I was working with a guy last night who told me something I'd never heard before. He wanted Lead to put up a hand for a 3-point attempt in his area, and then have Trail pick it up and signal if the shot was good. Lead puts his hand down once Trail takes it, while the shot's in the air, and doesn't signal if it's good. His rationale was that Lead should stay with the shooter and not even see whether the shot went in.

I've never heard of this mechanic. In my world, Lead has 3-point responsibility on his side from the FT line down to the corner, and Trail has the 3-point circle the rest of the way around. Each signals on an attempt from his area, and signals if the shot is good. Trail mirrors Lead's signal for a good 3-point shot, but not vice versa.

What do you do?