She's paused, wondering what might be stopping the volcano, whether it's a power like her channelling, a weave could certainly influence something like a volcano. Or if there's more to it.

And what are the children really for, why do they have to be sacrificed?

"Fewer he may have asked for but he could increase the demand still. Has anyone ask how they kept Sanwon silent? Why they offer to?"

Not why they do, that's obvious, but why they offer.