That was along the lines of one of York's ideas, a plague. He tries to imagine a whole city full of people with something like rabies, and it's terrifying. They'd be violent, not just sick. He takes in Daryl's toughened demeanor again and thinks he might understand where it comes from now. The poor guy probably had friends, loved ones, lost to it. If it spread far enough, it'd be chaos.

"That sounds horrible. Were you immune, or do you have to catch it through fluids too?"