You had to see this one coming:

Now, however, according to a recent article in the British newspaper The Guardian, the Brazilian official who took the photos, José Carlos dos Reis Meirelles, admitted that he has been studying the group for more than two decades and that the “chance” meeting was no accident. “When we think we might have found an isolated tribe, a sertanista like me walks in the forest for two or three years to gather evidence and we mark it in our [global positioning system]. We then map the territory the Indians occupy and we draw that protected territory without making contact with them. And finally we set up a small outpost where we can monitor their protection,” Meirelles told Al-Jazeera, according to the Guardian.

This picture makes a lot more sense now:

“Here comes that bastard from the government who keeps waking us up with his airplane. Let’s kill him this time!”