Glancing backwards when he heard the trill, Duo spotted the glimmer of sparkly yellow on Toothless's forehead before the rest of the dragon- and had to stifle a snicker.

"Hey, Toothless! I see you're the Halloween spirit, too?" He asked with a small wave, tipping his hat to the dragon. He had no idea the dragon was asking about the whole ordeal. "Well.. whether you like it or not I guess. Is Hiccup around too?"