Vapour Trails Unzip the Sky. The End of The World?

Painted warriors from one of Brazil's last uncontacted tribes have been photographed for the first time. They were spotted in Brazil's far western Amazon jungle near the Peruvian border.

But what were the reactions of similar tribes to the first vapourtrails in the sky? To something unprecedented in their cosmology or folklore. Panic? Anticipation?
Surely there must still be people alive who remember the occurence in their communities. Or anthropologists who were told what those first experiences meant.

Calling all anthropologists.