At this point, Wangji has decided to stop making any assumptions at all after seeing at least one person transform. He should really have known better.
"Mn, it would have been a difficult rescue if anyone fell." And embarrassing. He looks at her, "You think this is a gas giant with orbiting... fragments? Capable of sustaining life?"
He is not a scientist.

He nods in agreement, deciding to get some more 'tea'. He will offer to pour for her.
"The incompatiblity does have a distinct edge to it. Has this happened to you before on a mission?"

He smiles a little at the talk of brothers.
"That sounds an interesting arrangement." He looks at her askance, "You have travelled worlds before the train?"