[Aether doesn't initially notice that Childe approached him. He flinches when he's spoken to, then attempts to keep calm, because it's hard to tell who may be watching.]

I don't know who that was... [He confesses, fighting an urge to grab onto his knight's arm for support, to let him know that things are not well.] I... can't say I enjoyed that dance.

[He hesitates, then in a lowered voice he mutters:]

...He seemed to know too much.

[Then he shakes his head and looks towards Elise and Luke. Again, he feels awful for not telling them anything, even though they're both in danger as well.]

I hope I didn't worry them, too. I'll go let them know I'm fine.

[It's better not to stand around and attract any attention.]