Jareth smirks in amusement as the Pirate, as expected, chases after the magical bubble, laughing slightly at the rather amusing sight of the pirate even jumping onto tables to chase the bubble.
He turns to Zack when he speaks, looking the man (Kitsune?) over curiously, gaining a slightly interested look at the mention of a bookstore, "A bookstore, hmm? How nice... I shall stop by at some point to see what all you have."
He looks thoughtful at the inquiry about his magic, "Oh, that? It's merely a crystal..." He seems as if he might say more, but he stops himself and asks a question of his own, "You're... A kitsune, yes?" he tilts his head curiously, "I create the crystals."
He glances toward the food replicators, trying to figure out their use as he waits, but mostly keeping his attention on Zack, even as he calls another crystal bubble to his hand, idly spinning it, flipping it up to balance on the tips of his fingers and letting it roll down the back of his hand, and back, not actually seeming to much notice the idle gesture.