Aestrix giggles quietly, where only Kose can hear her, at the banter.
After the puzzle is complete, the door to the alcove containing their prizes opens. Normally, she'd push past her social anxiety to properly congratulate them, because she has a sense of dramatics and wants to fulfill the aesthetic properly, but. ... It seems tactically smarter to be shy. More nonthreatening. Much closer to the good shy cute nerd who just wants to hide in a corner and make pretty things and neat artifacts.
"Congratulations," she says softly, all shy awkwardness. "I, um. Made communication artifacts as a reward. Kose, can you, erm. Explain how to work them, please?"
The funny part is that she does sincerely want to go hide in a corner, too. Just, well, this is not how she usually tackles her social anxiety. It's kind of weird to lean into it instead of away from it.