"Yes, well." He really didn't have anything else to say. He wasn't about to go another few rounds with Lazzara, and sleep sounded incredibly tempting, even if it was nearly time for breakfast now. He could skip breakfast and have a House-elf bring him a scone to eat on the way down. That sounded even more tempting.
"All right," he decided finally. He turned on his heel to leave, then turned back and added, "Good day."
They weren't all raised in car parks here, after all. The best defence was always to be polite.