They still don't really understand, but they're not going to argue with Misty when they've only just found her again. And it's not particularly comfortable to be lectured for doing exactly what they want to be doing, for once. So they nod once, a little hesitantly, and say, "I'll be careful. I'm not the only one on patrol. And I am eating well to make sure I'm in optimal condition." Since she worries about them eating enough, like Crowley does, she ought to be pleased by that, at least.