[The skeptical eyebrow only makes him smirk. He's got no problem proving himself. It's one of his favorite hobbies.]

Hope you've got a strong stomach. This'll be gross to watch.

[And it is. It's no instant transformation, blink and he's something else. It's a gradual proces - lips bulging into a beak, body shrinking, arms shriveling and sprouting feathers, his clothes falling around him. But in fifteen seconds it's done, and there's a big bird of prey standing where a human boy once was.]