No need to ask "Do you understand?" Give the warning, give the ball to the inbounder, if the player ignores you, T time. This is one of those situations (blowout, extended garbage time), where it pays to follow mechanics to the letter, get out and go home.
Having asked the question, I don't feel you should be offended by the lack of response. Since you're not supposed to be asking the player whether or not he understands you, how can you penalize him for not responding?
While common courtesy demands a response, the rule book doesn't. At this point, it's time to move on.
|