Percy brandished his wand and said, "Accio old silver key!", but absolutely nothing happened. He sighed. To no one in particular, he grumbled, "No, of course not, why would this be sensible?", and then strode over to the broom lying innocently on the ground. "Anyone want to bet the keys attack me as soon as I pick this up?" he inquired. Three heads shook. No, they were not in the habit of making poor bets. "Anyone know a Shield Charm? We did those in third year ... " But no, the twins were shaking their heads. " ... right, Greengrass was the only competent Defense professor we've had since Director Bones was here in Bill's second year, wasn't he. Great." And it wasn't as if it would be at all sensible to make anyone else do this. Ron only barely knew how to fly, and the twins, human Bludgers though they were, were terrible at catching things, even Quaffle-sized things. 