Strange backcourt violation

[jamie]

A1 is dribbling up the court just before the half-court line he attempts to
dribble behind his back. The ball stays behind him in the back court while
he continues into the front court. A1 stops, turns around and with both
feet in the front court, (the ball has bounced once in the backcourt).
A1 then gains control with both feet in the frontcourt but dribbles the
ball in the backcourt.

A1's dribble was clearly interrupted, is this a backcourt violation or does
the 3 point (two feet & ball) rule still apply ?