If he had not killed her, the tribe would have killed him.
4 seconds sound clip from the Cannibal Holocaust movie soundboard.
You can hear this line at 00:23:18 in the Blu-ray version of the movie.
Quote context
[...]
- You like it? Eat it it's all yours, go on stuff yourself.
- Just sit back and enjoy the show, because afterwards he's gonna take us to the village.
- Don't be a fool! Come on, Professor!
- That punishment is considered a divine commandment.
- If he had not killed her, the tribe would have killed him.
- Well, it is no masterpiece, but it'll do. Can you guess what it's for, Professor?
[...]