He had always been too smart for his own good. She didn't want to talk about the spell she used to track him because of the promise she made to Draco. Even thinking about the oath she took was upsetting. She'd somehow managed not to think about the tracker in the days since she left his flat. Or at least, not to obsessively think about him. She didn't want that to change. Instead of giving him a direct answer, Hermione just smiled.