Zack glanced back at him for a moment then continued looking around - more because he wasn't sure what Xander might see in his eyes than actual interest in the shop. Afraid of dropping his guitar case he sat it down as well and his fingers immediately went to picking at the threads of his gloves again.
"Thanks," he said finally. "So, um, do you." He fell silent again, for a moment looking like he was going to flee, then he seemed to gather himself. "So - how long have you been back?"