[Spence]

We are to issue a warning if a defender crosses the plane during a throw-in assuming no warning has already been issued.

Team A scores and is now down 1 with 4 seconds left. B is out of timeouts and immediately steps across the boundary without touching the ball or the thrower. I assume by rule we blow the whistle, stop the clock, and issue a warning. If so the defense has gained an advantage by having the clock stopped.

Am I right on my understanding?