A ring of fire suddenly encircled them, the flames licking to knee height. Hermione felt the warmth envelop her, as well as another touch of that low intensity magic. Then Narcissa clapped her hands three times ... and all the witches pulled simultaneously on their tassels, letting their robes fall to the floor. Not one of them flinched at being suddenly naked. Not even Luna. But, then again, she'd always been a little quirky that way.