Fire Dragon's Fire Circle

Fire Dragon's Fire Circle (火竜の火円 Karyū no Kaen) is a Fire Dragon Slayer Magic spell.

Usage
The user turns their arms and/or legs. Following this, the fire generated from them extends in a big circle that traps the enemy. Redder can then burn whatever's inside. He can also use a different version where he transports the flames in a line around a building, splitting it into two. The technique's name is actually a pun.

Trivia
Kaen (火炎), with the kanji "炎", means "flames", while Kaen (火円), with the kanji "円", meaning "circle", means "flame circle". The pun is obtained because of the equal romanization of both expressions.