In an instant, countless pieces of knowledge regarding Transfiguration poured into Devereux's mind like a tidal wave.
Most of it he had already mastered from Dumbledore's [Transfiguration Genius] trait, but the part concerning the Animagus transformation was entirely fresh.
For some reason, Dumbledore had never studied this branch of Transfiguration, whereas Sirius had reached the level of mastery in it.
Chapter 387