Jackie gives him an unsure look. "...Is that going to hurt or harm me or something?"

He doesn't see how it would really cause an issue - he knows what his aura looks like because he's been told, and it's essentially like that of a human, just duller and less colourful, with no other outstanding features. But he also doesn't know if an aether is really an aura, and if this is some kind of invasive thing, he's absolutely against it.