William sat up gingerly, glaring at his unprovoked attacker. "Yes, because I look precisely like a House-elf," he replied tartly, although he really couldn't blame Pete for the assault. He was, in fact, glad that someone was here defending his House. Somewhere. Deep down.
"Thank you for looking after the Tower," he said, only mildly grudging as he stood up and dusted himself off. Or made a cursory attempt, anyway; after the trip across the roof, his trousers appeared to be a complete loss. He looked at Pete again and offered, "I thought I'd come and help."