Don't be a jersey plumber?

[Amesman]

Search has not found past discussion on this adequately, so given another recent thread's segue into blood on jerseys, etc. ...

Junior needs to change out of a jersey, for whatever reason (blood, wrong type, illegal fashion details, etc.). Officials instruct him to leave (or not enter) game.

Time out. Junior is engulfed by teammates. Nobody can see any disrobing, but -- voila! -- Junior is suddenly ready with legal/adequate jersey as timeout ends. No way he left the visual confines of the court, but nobody actually had a visual of him changing.

Whaddya have?

[Does 10-4-1-h's "within the visual confines of the playing area" mean actually seen within this area, or does it mean reasonable deduction tells you it took place in this area and still must be punished?]

Seems this would not be place for an ordinary "don't be a plumber" admonishment but would like to know from the collective wisdom here.