Ron quite liked the idea of using the Summoning Charm again — Harry had explained about Aqua-Lungs, and Ron couldn’t see why Harry shouldn’t Summon one from the nearest Muggle town. Hermione squashed this plan by pointing out that, in the unlikely event that Harry managed to learn how to operate an Aqua-Lung within the set limit of an hour, he was sure to be disqualified for breaking the International Code of Wizarding Secrecy — it was too much to hope that no Muggles would spot an Aqua-Lung zooming across the countryside to Hogwarts.
Um, why can't he just buy it first and summon it from his room?
