That's what is. He's the son of a shaman and he's been consecrated to the spirit of the jaguar. Which also explains what they were doing this far from home.
11 seconds sound clip from the Cannibal Holocaust movie soundboard.
You can hear this line at 00:13:33 in the Blu-ray version of the movie.
Quote context
[...]
- Who's to say? The only thing I know is - we're gonna risk our lives to save those fuckers...
- Great warriors, these Yacumos! They're afraid of no one except the Tree People.
- No white man has ever seen them Or the ones who have, never lived to tell about it.
- Did you see this? Looks like the sacred scar of Ateri.
- They were caught, yet they are not really cannibals.
[...]