I agree that it is good game management to try to talk the players out of leaving the floor, but if they don't listen, you gotta use the whistle. If they are going to continue to travel, you don't stop calling travelling do you? If you don't call it, why would they stop?
As far as the screener, I'd ignore it, but if there is contact on the screen, it would be illegal as the player does not have both feet on the playing court. I would guess after you call the illegal screen once or twice, the coach would change the way his players are setting that screen, at least for the rest of the night.
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