Another back court question

[dsturdy5]

I haven't posted in a while but have been lurking for a while. Anyway, I have a backcourt question.

Team A has the ball in their front court. A1 dribbles the ball off of her foot. The ball is knocked around the front court by both teams for a few seconds. Team B gains posession in their backcourt (A's front court). B1 loses posession. A2 dives for the ball, grabs the ball with both hands to avoid traveling while sliding across the floor, she tosses it and it goes into their backcourt. A3 is the first to touch it.

Back court or no call?