He could have used the flames of Fiendfyre for his Pyromancy Skill as he could handle Fiendfyre too, but the flames of Fiendfyre would consume anything in its path. It won't differentiate between friends and enemies, whereas the flames of Protego Diabolica were a lot more versatile. That is why he decided to use them for his Pyromancy Skill…
Whatever It Takes... [HP X MCU (AU) Fanfic]
Movies · InGlorious
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