I really like that this episode brought back a character from a previous one and developed their relationship with Homura a bit more. It often happens in these kinds of self-contained episodes that a secondary character from the past doesn't become relevant again later on. Thanks to Homura's backstory, we're learning a little more about the fairy world and their way of life. This time, the enemy finally starts to take on a more antagonistic role and feels like a real threat. And the final scene is quite unexpected.