Jim does a double-take. Is that...? It is. What the hell, Crookshanks.

"You know what, I don't want to know," he decides, shaking his head. The cat can't answer him, at least not in a way he understands, and he doesn't know how long they have to get these things to Hermione anyway.

The message had said to give the ingredients to Crookshanks, but that does present a minor problem. "How're you gonna carry all this back with you?"