They were watching some sort of meat preparation and seems like they didn't like it too much. I saw the little tents in the back and those folks and thought of some kind of 'side show' of freaks in a circus.
Whatever are they looking at? The one on the left has seen something really quite unpleasant. The man in the middle, not sure but his furrowed brow and squinted eyes suggest that he's considering buying one. The one on the right looks more than a bit concerned. "Oh my god, he's going to buy one".