If he is supposed to be set off-guard by a large talking bird flying him into danger, he isn't, mostly because he lives with demons and dead people. So. As far as he knows, this could be a demon in its preferred form. It makes no difference to Copia, aside that he is not sure how he is supposed to combat a star-monster. Not to mention that he is unacceptably under-dressed for the occasion.

This is going to tax him immensely, but if he didn't try to help, then, well, what sort of leader was he? What was he supposed to do though, dance the beasts to death? Summon a bunch of dead animals from the forest to hurl themselves at it? This was not the way he was quick on his feet. "What am I supposed to do? Distract this thing with sex appeal? Write it a song?"