Rezo has indeed been hearing choral singing, and even if Zelgadis hadn’t decided to warn him, he has been doing void research. Still…

“The storms are where the tears are,” Rezo points out, shrugging his rucksack on. “And we’re supposed to be looking for those. I'm perfectly capable of ignoring a few hallucinations in the mean time.”

And besides that is the unspoken question: does Zelgadis really want Rezo to hang around in the same tiny shepherd’s hut as him? They both know that the answer is a firm no.