"So she says,," Nikolai nodded his head a little bit. His eyes narrowed, just a tiny amount. "But she could just be saying that. To cover up. The fact that her name's Elbert. And you. You're her sister. So you'd cover up too." Perfect sense! In a nonsensical sort of way.
"Maisie," he echoed, bobbing his head, and deciding that that was probably her name. "I've always thought. That Maisie would be a good name for a cow. Don't you think?" It wasn't said in a rude manner, or meant to be insulting. It was all just very conversational.
And then he held out the box of Bertie Bott's again, so she could take another.