The Quidditch captain looked slightly alarmed. "Er," he said, scanning the list to find where Percy had left off. "Er, Hooper," and across the room a voice said a bit nervously, "Here!" The other prefects were giving him vaguely sympathetic looks, but no one looked particularly eager to volunteer, so Oliver kept calling names from there. It was not a pleasant process; he kept losing his place as he glanced nervously at the portrait hole, through which his roommate had so abruptly left.