After being rescued from the slavers, Illy had been living with the other harpies in their village, but she was troubled because her feathers were falling out and she couldn’t fly anymore. Illy only agreed to be examined by Glenn if Tisalia was present. He thought that was a little strange but agreed to it. Glenn tells her the reason that she can’t fly right now is that she’s molting, but Illy doesn’t agree with his diagnosis and runs off. Illy is convinced that she’s sick and calls Glenn a quack doctor. As Glenn observes her behavior, he notices a change occurring in her.
is a very special type of molting 
where you get your adult feathers.
para que te salgan las de adulta.
para que te salgan las de adulta.
est une mue spéciale qui vous conférera
votre plumage d’adulte.
è di un tipo molto speciale, 
durante il quale sviluppi le tue piume da adulta.
...é uma especial, que vai trocar
suas penas de criança pra de adulto.
Сейчас у вас отрастают взрослые перья.