As for the tribes having some sort of ability to "know" something's coming,my guess is that like animals,they are so primitive,that they really are more like animals and are more attuned to feeling whatever animals do.Then,they could just be more sensitive to the way the animals behave and knew that something was coming.Six of one,1/2 a dozen of the other...take yer choice. LOL
The whole Duke stuff,no matter what they call each section,has to do with the paranormal.They've been studying this stuff for at least 70 years.
And the old USSR had teams working on this forward viewing stuff in the '50s,BTW.