His eyes were only on one person in the whole pub, though he wasn't being so obvious that anyone and their blind grandmother would be able to tell. Those who didn't know to see it wouldn't. That was the line Zach was definitely too sober to cross. But he was having so much fun, and it was a bit of fun, that was all.
If he continued not being sure if Fred were flirting with him consciously or not, Zach was going to be going through more beer from toeing that line. But he couldn't help but smile, even laugh a little, at the questions about approaching Fred. But Zach didn't play games - okay flirting was sort of a game, but that was different. "I heard someone call him," his head motioned toward the other redhead twin, "George while I was ordering my pint. I'm just using my five senses."