"I mean, not great, but I know what I'm looking for." Without access to enough magic for children's cantrips, Taako can't really do a thing about really figuring out what's going on. He's reduced to half-blind clinical diagnosis. This kind of thing could be done with illusions, with his own transmutations, with evocation in the hands of an inventive practitioner. A simple spell would tell him exactly, but no simple spells here.

He turns over with an odd, liquid grace so he's abruptly resting his chin and hands on the arm of the chair, experimenting with a few angles to see if that brings this stranger into better focus. It does not. "Recently shadowless, myself." He holds out a hand to demonstrate the eerie way the firelight travels right through uninterrupted. "Give you good odds on related phenomena."