Did Voldemort use fiend fire in his fight with Dumbledore?
I was listening to the audiobook where Crabbe loses control of fiend fire in the room of requirement and it sounded a lot like the fire that Voldemort used against Dumbledore in the ministry in Order of the Phoenix.
Was that fiend fire? And Voldemort was just more powerful and could wield it?
Edit: I know the duel in the book is different from the movie and there's no fire. But I'm asking in the context of the movie.