So many great things about this episode.
Paul and Rudeus' mended relationship. He's certainly better than he was before, as a human being, but still being recognisably Paul - a pervert who tries to brag about stuff and look cool in front of his son. Also mending his relationship with Elinalise, with Rudeus' internal voice mocking Paul for not knowing that they're "family" now, mwahaha.
Geese still calling Rudeus senpai, after all those years. That TP book happening to be just perfect to brave that labyrinth would, most of the time, feel like a deus ex machina; but here it felt incredibly natural.
But the cherry on the cake was the end of the episode. It was just... right, you know? Roxy being surrounded by monsters, losing all hope, only to see the threat suddenly gone and some young man - her saviour - walking in, with a smile on his face. They could've animated Rudeus reaching her (how did he know that she was there?) but I guess that they'll do it for the next episode?
Like that other user often says... peak fiction.