"It'll be nice to let loose." To not be pretending to be just like the humans. He had this issue in Avalir, too. Eisfuura are humanoid, but they're not entirely tame. Even spending all day walking instead of flying feels like being hobbled, a pretty falconry bird on a leather glove, instead of everything he is.

(He gets real self-conscious about eating, too, especially meat. Perhaps Emery won't judge him for plucking out eyeballs to devour in the field.)