The gang's all here.

So the mystery man is named Joe.  It would have been nice to have known that before now, but I guess better late than never.  Despite the fact that there's a good chance that Salty and Sour have never seen Joe before, and despite the fact that they're both probably armed, Mark, armed with a single shot gun that might or might not be loaded, and backed up by two unarmed civilians (one of whom seems to be having a case of the vapors or some sort of medical problem that has yet to be revealed) who haven't exactly proven themselves to be capable of taking care of themselves, has just taken care of the rest of his pursuers.  Now he faces the problem of what to do about the two hatted ones and their green shirted accomplice (especially since the last panel looks more like Mark is holding Shelly and Pop at gunpoint rather than pointing the gun to keep Salty, Sour, and Joe in check).  Perhaps he'll make them repair the swamp buggy and then take them to the authorities, or maybe Rabbit (and possibly Peter) are hiding just off-panel, waiting for the right moment to step out of the dying foliage and turn the tables on Mark.  (If I were them, I'd make sure that I knew where Andy was since he's proved time and time again that he's more than capable of saving the day on his own.)