Why was Cheyenne following Harmonica?
We see throughout the whole movie that Cheyenne follows Harmonica, but they first meet in the bar where they have a harmonica-talking conversation.
After that we see that Cheyenne meets Jill at her new house, but before that we also see that Jill hears him (at night when she was searching the house) which implies that Harmonica was already somewhere around house.
So we can agree that Cheyenne followed Harmonica and than meets Jill, but not following Jill from the bar.
My question is: What was Cheyenne's motive to follow Harmonica from the bar to Jill's house (or anywhere where Harmonica went)?
Best Answer
Because the killers from the start of the movie were posing as his men. From the plot synopsis on Wikipedia:
In a roadhouse on the way to Sweetwater, where he also encounters Mrs McBain, Harmonica informs Cheyenne that the three gunfighters appeared to be posing as Cheyenne's men.
Here is the relevant dialogue, as provided by WikiQuote:
Harmonica: I saw three of these dusters a short time ago. They were waiting for a train. Inside the dusters there were three men.
Cheyenne: So?
Harmonica: Inside the men there were three bullets.
Cheyenne: That's a crazy story, Harmonica, for two reasons. One, nobody around these part's got the guts to wear those dusters except Cheyenne's men. Two, Cheyenne's men don't get killed. That surprise you?
In the past, Frank has framed Cheyenne for several of his crimes and even planted evidence pointing to him at the McBain house.
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Why does harmonica help Frank?
Eventually, Harmonica's motive for revenge against Frank is revealed: When Harmonica was younger (a teenager), Frank forced him to keep his brother from men while he was hanging. After Harmonica collapsed with exhaustion, his brother was hanged.Why does harmonica leave Jill?
Harmonica knew Frank's men would be observing from afar for the right moment to launch an assault. Tearing her clothes apart, sending her out, following her and then taking parts of his clothes off is to show vulnerability.Is harmonica dead in Once Upon a Time in the West?
He meets up with Jill and Cheyenne and tells them that he plans to leave, Jill hopes he will come back out of gratitude for saving her financially, before he and Cheyenne take off. Cheyenne soon reveals though that Morton shot him during a fight with him on the train before succumbing to his wounds and dying.Once Upon a Time in the West - Cheyenne
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Images: cottonbro, Simon Berger, Polina Tankilevitch, RODNAE Productions