An error, most likely. It is a detriment to most everyone, an unfortunate mistake, that they made it, as it were. Only then Frisk would have cried. Asriel, too, would have cried. It is for their sakes alone that they remain here now, and not drawn a bright red smile over their throat.

He is a poor actor. He does not keep anything contained, nor does he appear to be making any attempt to.

"How very unfortunate that you think so." Their tone is wry, as are their words. Far easier to deflect than to acknowledge the possibility that he may be, poor actor that he is, genuine.

Even more unfortunate.

"You've interrupted nothing. It is perfect weather for a walk, after all."