Deflecting off A3's does not establish team control for A. So to answer your question it "stands" until a team gains control.
If A4 was straddling the division line when he caught the ball (gained control) then it's nothing.
If A4 had one foot in the front court and the other in the air when he gained control then the foot that was in the air came down in the backcourt... then that would be a violation.
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