A few rapid blinks of naked surprise is the initial answer. Will takes a moment to parse the information. Nothing ought to seem ridiculous at this point yet he still stumbles over new concepts as if the floor of his mind is littered with action figures.
"A broom?" Incomprehensible images turn like a Rorschach test in his mind until he thinks he has it the right way up. "Is he a witch? I've never heard of a boy riding a broom but... that's the only thing I can think of. Is it magic?" Honestly, broom-riding boys is hardly the strangest thing in Preya. In fact it is fairly amusing and a little endearing. Will is tragically ill-equipped to interact with other children but he can not help the pricking of interest he feels. He'd like to meet this strange neighbor.
Clearly the young artist will not be finishing this portrait. Despite the distress he feels at soon losing Cassian's expressive face their conversation is too intriguing. Vital communication will be lost if he stares at his sketchbook. Hesitantly Will closes the notebook then leans forward a little in his seat attentively.