It's practically Kaworu's natural element, perched precariously on some elevated piece of stone. His expression is that cryptically unsmiling one that signifies some change in his mental state neither negative nor positive.

"...where is 'here?'" he asks, because obviously it's nowhere he knows or is meant to be. He, too, watches the scene down below--but with an attitude as critical as confused.

Frisk is both here and there. Body and soul. And while the duplication is something both he and Frisk can see with their eyes alone, Kaworu can also tell that there are not two souls down below them, but three.

"There's someone with you. Down there--who is it?"