It’s called a downline disembarkation. It can be done, in the past, if the country your friend disembarks to allows it. Covid protocols have mucked up many of travel plans and what was once commonplace is no longer allowed. RCI suspended this practice on all ships a couple of years ago. If NCL allows this and a fee is involved from the pending country, you can bet that fee will be passed down to your friend. You won't get a definitive answer on this forum. Call NCL for guidance. Can you post the progress/answer for your friend back on this forum?