That would be a very good guess. Tiera is definitely more connected to birds than humans, though there's a few humans she's fond of. When asked about the king of the death realm, she takes a pause before carefully enunciating the name "Xibalba" in her more screechy voice, wondering if that name will also be familiar to the girl.

Although, of course, the extra death is more of a concern right now. "Knife magic too strong," she mutters. "Even stop other magic." Although apparently it did take an extra dagger to knock Usagi out of whatever that transformation was.