Ball Handler OOB?

[CDurham]

Had this last night.

A1 is dribbling from backcourt to frontcourt close to the sideline. He is getting blocked out towards the line and decides to let the ball go (he was dribbling) as he stepped on the line. He then however did not regain possession of the ball and let one of teammates grab the loose ball.

Was this a correct no call?? From what I observed he knew he was going OOB and sort of pushed the ball forward towards the division line and then stepped OOB. His teammate then grabbed the ball and continued up the court.

I know the book says even though a ball handler is not in contact with the ball if he has possession of a dribble and steps OOB, it is OOB.

Thanks