Unsportswomanlike Play?

[Sven]

Just before play resumed for the second half of a frosh girls' game, Team A coach wanted to give me a heads up on an out-of-bounds play she intended to run under her own basket if the opportunity arose:

Immediately after the ball was at the disposal of A1, A2 (while still in bounds) would walk toward the spot and announce, "No, I'm supposed to take it out."

The defense would supposedly relax for a moment while A1 passed to A2 under the basket for an easy two.

I told the coach such a play would be unsportsmanlike and would result in a T. She didn't run it.

At the time, I wasn't certain if I was correct or not. Still not sure.

What's the ruling?

Sven