Dang It!

[Welpe]

9.2.2 SITUATION C is close to this.

A1 scores a basket. After the ball goes through the net, B1 grabs it and makes a move toward the end line as though preparing to make a throw-in. However, B1 never legally steps out of bounds, both feet remain inbounds. B1 immediately passes the ball up the court to a fast-breaking teammate, who scores a basket.

RULING: Cancel Team B's goal, throw-in violation on B1. The ball was at B1's disposal after the made basket to make a throw-in. B1 must be out of bounds to make a legal throw-in. (7-4-3; 7-5-7)

I'd call the violation as soon as it is clear he has no intention of taking it out.