The origin of Woodmen
Did you notice that the sitting woodman who welcomed Bad Coop inside the convenience store was drooling exactly the same way does the drunk in Twin Peaks jail and the kid in the car ?
I think the drunk is a woodman in become. He doesn't bleed, he is saturated with the black thick liquid (burning motor oil)
Woodmen used to be human beings who were contaminted by a kind of curse, or evil spirit...