Three hours later:
"I knew it!" screamed Harry. "Page four thousand, two hundred and one. 'If an abnormally ugly serpentine creature happens to be playing Seeker and happens to have eaten, swallowed, absorbed or otherwise consumed the Quaffle, it is acceptable for the opposing team to demand a new Quaffle come into play, until the first can be extricated from the opposing Seeker. On top of this, however, the team making the claim must withdraw their seeker for the duration of time when his/her opponent is undergoing necessary procedures!'
And a sharp blow to the evil team's winning streak as a new rule is found..."
"Excuse me!" interrupted Voldemort quite rudely, snatching away the book. "My snake is NOT abnormally ugly!"