why is chato rejoicing, when he sees that his pursuers are with the mexican scout?
i liked the religious guy, so i did not understand he had to die that way, but maybe the movie wants to show how bad it is to let bad things happen and "just pray" without changing something?
I don't know that he is ever "rejoicing," but Chato needs the Mexican scout because he wants the posse to be able to follow his trail, and the scout is the only one he can count on to pick up the clues he is deliberately leaving for them. Chato intended to lead the posse out into the middle of nowhere and strand them with no water, figuring they would then have to give up the chase and go home. Then Chato could return to his own family without fear of being followed. Unfortunately, this is where Chato proves to be fallible too as he underestimates the determination of the Hooker brothers to find and kill him and the resourcefulness of ex-Confederate and Indian fighter Quincy Morris.