Actually, that is quite common around here-especially if the property fronts a creek or river. Most times the property owners look the other way as long as you’re civilised and don’t make a big mess. My family has been regularly camping on and off on a choice creek spot for years that isn’t ours. That’s just how it is here. It’s nice. But we always leave the area as we found it.
The owner(s), a different person who didn't belong to the Foster family came down to confront them. The fiance of the woman who owned the site shot one of the Foster family members and kilt him dead!
We have some Freepers who post here regularly who have a similar idea of what constitutes "trespass", and they've sworn they'd fire on someone for crossing the line over onto their fenced and posted property (even if the notices were hidden by heavy underbrush).
So, what we seem to have is an illegal alien acting on behalf of a property owner to drive off (and kill) trespassers.
Kind of unusual occupation for an illegal, of course, since usually we are reading about how someone managed to shoot one before he broke in the house.
Lord help us if we are now employing illegal aliens to do "run 'em off the property" events that Americans won't do!