I just saw this

[Zoochy]

A1 has the ball for a throw-in. Team B is applying real good full court pressure. A2 starts running parallel and real close to the endline. A1 extends the ball past the vertical plane of the boundary line and pushes the ball against A2 and quickly pulls the ball back. It looked like A1 wanted to hand the ball to A2, but A2 did not want to grab the ball. It was like a fake hand off with the ball coming in contact with A2's belly. Violation?
What would it be if A2 is replaced with B1?