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They are saying goodbye in their own way. Playing outlawed tunes on outlawed pipes.
— Uncle Argyle · Braveheart

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker describes a farewell expressed through music, with both the tunes and the instruments forbidden. Saying goodbye in this way also means crossing a boundary imposed on that expression. The repeated word 'outlawed' gives the personal gesture an edge of defiance.
Context reviewed