Help!!

[WooPigSooie]

My partner and I were officiating a high school game tonight and, for the first time, ran into this situation.

Inbound underneath the basket after a foul. A1 throws it about 2 feet to A2 who has gotten good seal position on her defender. Realizing she has maneuvered too far under the goal to get a good shot, A2 she sticks the ball out to handoff (not pass which is a key point) to A1 who is coming inbounds after the pass. Pushing off to gain more leverage and speed, A1 is clearly on the baseline when her and A2 gain joint possession of the ball. It was a split second action, but they both have solid possession. Is this a violation because A1 had dual possession with a teammate while she had a foot out of bounds or does A2, by the book, have possession until she releases the ball?

Hope that was a clear description of what happened.