[Video]

[Hiccup doesn't answer either, not catching until a few beats later that he's been just...sitting there with his mouth slightly open. Quickly he shakes his head and leans back a little, absently brushing some eraser shavings off his blueprints with the back of his hand. He clears his throat a little, watching Sprocket for a moment before looking back up at Arcee.
What's he supposed to say?]

Um....h-hey.

[WOW that sure was an awkward voice crack/stutter there. Maybe she didn't notice.]