"You're mad if you think you can get my wand from me without a serious fight, Potter," she teased him. She wouldn't actually hurt him. Well, not much. She might hex him a little, but all was fair, right?
Besides, she was fairly certain he was just having a go at her and that they weren't being serious here. Which was nice, actually, just being able to joke around with him again. It would be great if it could stay like this, without all the awkwardness.