[just another ref]

Originally Posted by BigCat

4.15 something and 9.5. These are the plays where a player ends a dribble, then throws ball against official or opponents backboard. case play says doing either is another dribble "provided..he is first to touch it."

Here, tossing it to the floor after the first dribble ended...is another dribble "provided the player first to touch it.."

If another player touches it first, the flip to the floor becomes a pass.
that's how i get there.

The case play where the dribbler bats the ball over the head of the opponent then runs around and touches it a second time specifically refers to a touch with the hands in order to have a violation. I would apply that same principle here.