Ezra Miller

“When the Obscurus bursts out [in the first film] it also kills some of his foster siblings, and lots of people presumably got taken out in New York City when it mashed around. Here there’s one moment where they got attacked and Nagini is safe in that encounter. A tool like that is for focus and direction for preexisting magic. You think of channeling something down the waterways down a branch of wood. It feels like a metaphor for an artist: If you can survive your trauma, and then survive your survival of it, and then you can figure out a means for directing it, that’s power unknown on the face of the earth.”

Source: EW