help me identify a movie

Hello, this is the second time I post on this website hoping I would find an answer. 

I saw this movie around 20 years ago. It includes well some torture but it is not a horror movie. The scene I remeber and which was really horrofic is a man being tortured on a cross by some evil woman and I think belongs to a certain tribe maybe Indian. Well the scene goes more gruesome when she uses a scissors to cut some flesh from his stomach or belly while he screams for mercy. From a distance, his friend with binocolors and a shotgun shoots him dead to save him from his pain. Then, all the people and that woman run in panic from the sound of the gun. This is what I remember. Thank you