If the weather's moderated a bit, I guess if I were you my first thought would be to put the roo in a small cage; small enough to be fairly easy to carry; and maybe take him back to that area where you found him; carry him around a bit; chances are he'd make a little noise and it might attract some of the others, or, if you're really lucky, they might at least make a noise back; that is, if any are still alive. Don't know what the layout of the area is, but it might work.Some people are idiots, who could do such a thing and still sleep at night?