It takes a second. They're still not fully up to speed, mentally speaking. But they look at 'Frisk' and swap the colours and... oh. It's the first one they met here.

"Ah."

Their vulnerable state, and the fact that two people saw them in it, fully smashes into Chara and they stiffen, sitting a little more upright. More effort is being put into tolerating not-Papyrus's presence around them, like a lion very patiently staying still while a thorn is removed. The second eyesocket sparks to life, and they brush some of the dust off their lap absently.

"Bone wings, I presume?"

Chara vaguely wonders what kind. There'd be an irony in either.