You betrayed him. Instead of light, you chose darkness and your friend, if he even was one, didn’t like it.

"After all, you choose defiance? Why would you break our alliance?"

Was the Owl.. offended? Melancholy? Wicked? Or maybe even all at once... But the fact that he didn’t like your choice was very visible. You hurt him mentally, which simply could not be forgiven with ordinary words.

"Betrayal's cost is far from free. Shown yourself, now you'll see me."

after Owl said this, you could see his real face. His beak was just a fake, his real and big mouth was hidden below.. under his feathers.. with sharp zumabi... His intentions were not friendly.