"Why dilute the sting with other troubles?" he asks pleasantly. "You have placed yourself in debt to me, on my terms, not yours. That is something to be savored at my leisure, I think."

As much as Schön might like to needle Naugus about living things being bags of fluid and yet somehow beyond the reach of his water-mastery, he refrains, not wanting to give the other mage ideas. Let the dagger of that debt be twist enough for now.