The Butler is not quite certain why he should be thanked, but he can try to answer that question. She would not ask unless she wanted to know, he believes.

"We are much relieved that the effects on the humans aboard seem to be fading, Brightness Kholin."

Worried also about the failure to find a reason for why these things began in the first place, leaving them all vulnerable to whatever comes next; but that is a feeling which has not changed since the very beginning of their kidnapped life.