The Shade is the name that the tribes outside of Sweetwater have assigned to the amusement park's technicians, the guys in hazmat suits.
Hector...explains that the masked monster is a "shade" who walks between worlds. The shade was apparently "sent from hell to oversee our world," confirming Maeve's sanity.... Source.This is all science-fiction, of course, but appropriately alerts Forteans and synchromystics to the continued awareness being brought forth to the television audiences of aliens, outsiders, and others being introduced into our culture.
Travelers in space suits, aliens all, may be distance journeying people from faraway or merely time travelers from our future. Who knows?
It is true that folks in gear to protect themselves may only look like aliens to us on another time-space plane.
What I merely wish to state is that HBO's Westworld is a new entry into our future programming within our modern society's point of view. Curiously. We are being prepared for something.
Kachinas are definitely seen as travelers between this world and another. But what other world is that? Discussions of kachinas as aliens, of course, is nothing new.
November 7, 2016: The Fortean news website Daily Grail has joined the roundtable on this with "Alien Abduction in Westworld?"