"Ah, it's good, but..." he starts to check his form. "Maybe... more like..." he guides Wei Ying's wing through a motion. "Like that. Birds only make it look easy because they practice for a long time. They aren't born knowing how to fly."

They also have to be taught, and they don't know other movements. How long did it take Wei Wuxian to learn how to write?

Aziraphale nods and says, "try to fly up a bit, but not too much. You don't know how to land. Just up and down, one step."