Backcourt Violation

[MelbRef]

I talked with a fairly knowledgeable official recently who said this situation is a backcourt violation.

His assertion seems to violate my criteria of 1)Team Control, 2)Last to Touch/First to Touch

I wonder if there is some technicality that I'm missing...

- A1 inbounds the ball from their frontcourt endline.
- The inbound pass deflects off of A2 while in the front-court, and rolls into the backcourt.
- A3 retrieves the ball in the backcourt.

His ruling, "Backcourt Violation"

He says that if A2 retrieves the ball, rather than A3, it is not a backcourt violation.

Am I missing something? I don't see that Team Control in the front court has been established.