A Taste of Their Own Medicine: The person who kidnaps Filo keeps on forcing the poor girl to dance and "sing" for his customers. As soon as Naofumi discovers where she is and frees Filo, the kidnapper barges in and calls them thieves. What does Naofumi do? Burn him with his Wrath Shield? Nah, that'd be too leisurely for scum like him. Instead, Naofumi uses a unique shield that places said person's mind in a realm where, instead of ordering poor Filo to "dance and sing", the ghoulish "patrons" order him to do the exact same thing he told Filo to do earlier, making Naofumi's revenge against the insolent bigot all the more exquisitely satisfying to behold.
Chekhov's Gun: The locks of hair that Naofumi absorbed into his shield after giving Raphtalia a haircut back in Episode 2 plays a major role in this episode.
Hero with Bad Publicity: Once Again, Naofumi is looked down upon when he's stated to be a Cardinal Hero after arriving in Sikul, granted in this case it is because Cardinal Heroes in Glass' World are looked upon as Regional Lords and that the world was on-edge due to many Vassal Heroes going missing and the people of Sikul who Kizuna had Lordship over had assumed that Naofumi was the one responsible.
Paper Talisman: Filo's slaver keeps her helpless by using a paper talisman to lock her in a smaller, more helpless animal form. Apparently they work like slave crests in Melromarc.
Rabbit Magician: Ethnobolt is an anthropomorphic rabbit that can take on human form and is skilled in magic.
Surprisingly Realistic Outcome: Filo's slaver's attempt at forcing Filo to perform drives away the crowd he tries to attract. Even if they can't understand what she's saying, they can tell she's clearly upset and can't bring themselves to enjoy the "performance."
Having hatched Filo, Naofumi is able to recognize his "Daughter"; even when in another world where Filo was transformed into a Humming Fairy instead of her normal Filolial self.
Having hatched Filo, Naofumi is able to recognize his "Daughter"; even when in another world where Filo was transformed into a Humming Fairy instead of her normal Filolial self.