"Pity. I'd brought along a few things I'd made to trade, but I'll take you up on that offer." He pauses and considers his mood and temperament before continuing, "Just not today."

When Sirius asks his last question, the knife edge remains to Harry's expression and there's a subtle, strange change to his body language that should remind Sirius he's sitting near a fairly dangerous young man. Harry's temper appears to be restrained, it is not entirely controlled.

"Did you ever met Melkor or Mairon?" He's not much of a hand-talker, but when he mentions their names, there's an aborted gesture towards the plastic bag.