Zach waited for Gilbert's answer. If the man just wanted to...sit back and watch something by himself - and Zach didn't know, maybe take notes in his notebooks - Zach was okay with letting him doing that and going. Gilbert didn't owe him anything. Zach had brought up the telly, offered to help set it up. And Gilbert had already shared food and offered it.
"I can always get a telly of my own if I see something I really like that you don't," Zach replied with a shrug and a smile. "Well, lets check out what muggles are interested in."