[Ref in PA]

Just as we can judge a ball hitting the backboard either a try or a pass and as we can judge an airball a try or not, I think we have to judge the release by A1 a pass or the start of the dribble. It is important to make that judgement in this case because that will determine the status of the ball. Rule 4-4 tells the definition of the location of the ball and 4-4-6 talks of the "three points" rule: "During a dribble from backcourt to frontcourt, the ball is in the frontcourt when the ball and both feet of the dribbler touch the court entirely in the frontcourt."

Based on the original question calling the release of the ball by A1 "a pass" then I think we have to end the 10 second count and the ball changing front and back court status now has meaning. So when A1 begins dribbling, he begins dribbling ball that was previously "a loose ball", not a continuation of "a start of a dribble." So, the more I think about it, I am leaning toward calling it a violation.