Is it a Pass or a Shot?

[BktBallRef]

This is not traveling, guys.

4-4-5
A ball which touches the front faces or edges of the backboard is treated the same as touching the floor inbounds, except that when the ball touches the thrower's backboard it does not constitute a part of a dribble.

Had he dribbled, thrown the ball to the floor and then caught it, it's a double dribble, as it would constitue the start of a new dribble. Had the ball not hit the backboard, then it's traveling, as it would be a self pass. But if the ball hits the backboard, we've got nothing. It's perfectly legal to throw the ball off your own backboard, run, and catch it. You can even throw the ball off your opponent's backboard, run and catch it, as long as you haven't previously dribbled. (4.4.5)

And don't respond that it isn't unless you have a rule or case play to back your self up.