A1 is holding the ball while standing out of bounds during a throw-in. (a) A1 extends the ball across the boundary plane and A2 (a TEAMMATE) touches the ball, but does not take if from A1's hands. or (b) A2 (a TEAMMATE) reaches through the boundary plane and touches the ball, but does not take it from A1's hands.
In both cases, A2 then ceases contact with the ball and A1 makes a throw-in pass to A3. Has a throw-in violation been committed?
Just don't ask Tony!