The temptation to bite back with snark is there, but he contains it. He shouldn't argue with confused children. The right course of action, however, eludes him.

"She's-- I don't think you're going to find any adults in this house. Outside of it, maybe, but you won't find this Winnoc or your parents in Hinoto-Ri..."

There just seems to be no way to break them out of the constraints of being children: Aoi especially. "I know you probably have no reason to trust me, but... can I at least make sure that you're dressed warmly and fed?" By now, his voice is hushed, sounding vaguely confused and defeated. Another oddity thanks to Hinoto-Ri, just what Otonashi didn't ask for.