Over and back, or not?

[echo]

I recently had a game and need some help on a call. A1 shoots the ball from under the board. B1 blocks the ball and A1 saves it from going out of bounds. In doing so, A1 scoops the ball and it flies to the division line causing A2 to do the same. A2 scoops the ball causing it to go backcourt to the other division line at which time A3 gains control and dribbles back to try again. Coach B is yelling backcourt.
My partner and I didn't call backcourt because we felt no player had gained control of the ball and all were just trying to keep the ball in play. During a dead ball we asked another ref, who was in the stands, her take on the call. She said we missed the call since it is the last player to touch the ball. Since A2 was the last to touch it, it should have been an over and back call. IF, B2 had last touched it, before it went over the line, it was a good no call.
Did we miss the call?