I have a good test question..see if you can get this one

[JTRICE]

Held ball.
Possession arrow is pointing toward Team A's basket.
Official hands the ball to A1 for the throw-in.
B1 reaches across the end-line as he is trying to defend the throw-in.
Official blows whistle and warns Team B for crossing the vertical plane on the throw-in. The warning is recorded in the score book.
Official starts the throw-in again.
Throw-in is completed.

Official does NOT change the Possession arrow.
Is the official correct?