He was talking about the equivalent of ingredients required for a potion. What they were going to be doing. He recalled the old books on "alchemy’ about Nicholas Flammel. Where the man gave a short description about just what made the stone that had kept him alive for that long. How it was said it was an "equivalent exchange’ of things. That was exactly like how it felt. He got to eat, and she got something eaten from her that seemed to be building up to bursting. Maybe he should leave her alone, but worry over what would happen if he didn’t came to him. What would happen if that strange frustrated dam burst? He shivered a little. No, he’d have to go visit his ancestor and ask in person. 