Folgore's Badass metaphor thing (not sure if there is a trope for that), that he used to convince Kanchome to stop (I'm paraphrasing but this is the main conversation the two have, minus the flashback).
Folgore: Don't you understand Kanchome? A bird won't rest on a lion's fangs.
Kanchome: Then... what you said that night... but... but... I don't want to go back to my weak self!
Folgore: Kanchome... I forgot to tell you that night... but the hippo is strong... especially when it's protecting its children... IT CAN EVEN DEFEAT A LION!!!