Heh heh. Draco and Pansy will take good care not to let Snape know what they've done - you can bet that they'll blame amoral Aurors for the spell's distribution now that they know that Harry lost a Watch-em in the room. Such a convenient cover for their much higher-quality surveillance spells. Besides, I suspect that Snape is feeling pretty smug about flaunting his younger lover to the world, the snarky exhibitionist. ;D