"What? That boy? Are you insane?" As they've heard everything from William's perspective, it seems hard to believe that someone like Aran has come to hide for over 15 years now. The fact that no one knows about this until now is what makes everything convoluted. Still, even without the knowledge of the higher-ups, as soon as they stumble upon this kind of information, there are guarantees that they will investigate everything in order and put the boy in a predicament.
"Yeah, Aran Crossford is a monster... Well, it would be okay to answer like that, however, since he is just born with the blood of human and blood of a monster, a half-blood species will be more precise to say." William replied with a sneer on his expression. Considering Aran's body build and human nature, the blood on his other side hasn't been awakened yet. That's why the activation of his form doesn't happen.