Not only it expands the universe aboard the Enterprise - by showing casual crew that doesn't know everything like the main characters - it also brings up the story from the First Duty episode and its implications years later. I also like how the episode portraits Picard in a different (mean) light towards Sito Jaxa at first, only to give an explanation on it later through a moral outcome and pretty depressing ending. The performance by both Steward and Fill were fantastic. The speech by Picard at the end, where he omits completely the grave mistakes Jaxa did in the First Duty, and focuses only on the character and bravery, was also a nice touch. And finally, I love the very last scene with Worf sitting down as the episode ends without needing to say an additional word.