Xavius's expression betrays his assumption that they are no different from humans. He seem to automatically categorize them as human, likely influenced by Aurelia's frequent injuries from missions as a Hunter. From his expression, it's clear that he hasn't considered the possibility of them being anything else.
He must've forgotten that she survived the incident five years ago, as all mortals like Natasha had perished.
"Oh, you poor thing," Lynux says.
"Did you not notice at all?" she asks.
"Well, anyone would've made the assumption," Damien piped up.
"No, I assumed you two were human seeing how vulnerable you are whenever we face the creatures during our missions," he says with a frown. "You … you're not susceptible to the core's powers either."
