It was a widely known fact that humans considered beasts no different than animals and sometimes even worse. They even captured beasts to make them slaves and sold them to nobles and commoners alike.
They were even sold to factories and shops to perform hard labor, and their treatment totally depended on their masters. The effects of slavery didn't need any explanation.
Kiona's appearance was humanoid, but she still had bestial features which would be recognized one way or another. Once that happened, the Church would personally send people to eradicate them.
After all, a humanoid beast represented a high Evolution Stage and was highly dangerous to them. There was even a chance that they would take Kiona as a slave—as someone like her would surely sell for a lot.
Kael's group simply wasn't strong enough to face them, which poured cold water on everyone's excitement about their recent Evolution. It reminded them of their weakness.
