"Another time I brought him the potions and Rodolphus was there. He sent me away but I listened again. Rabastan was complaining. Said it was too tedious and demanded to know why they were necessary. Rodolphus said the combination of all three potions made it easier to cast the memory charms he used. I didn't know they were for you until later. I saw you drinking a vial and then you disappeared with Rodolphus. Thought at first you two were just... well, it doesn't matter what I thought. Then I thought Rodolphus was maybe casting spells on you. Mari said..."