Leaving Court Unauthorized

[gsf23]

I can't ever remember seeing a T called for unauthorized leaving of the court. And I don't think that it would be warranted in this case either. I would like to know what would be an unauthorized reason? I've seen it said here that running out to save a ball is okay, but running around a screen is not. Where is the line drawn on this rule? I would think that the purpose of this rule is to avoid deception on one team over another. I remember seeing a play on TV where a kid ran out of bounds and through a set of doors on the left side of the court, ran down a hall and came in through another set of doors on the right side of the court. To me, that would be when the rule would be used, not for trying to avoid a screen.