the three fights
the fist fight between McKay/Leech and the final gunfight between the major and Rufus were filmed a good portion of the duration from a bird's eye distance.
I've always thought this was an interesting way of showing the real significance of these kinds of violent rivalries - the choice of shot re-inforcing the theme that McKay's character has been pushing.
The distance helps demonstrate the insignificance. For McKay/Leech, take away the audience and nobody cares. For Terrell/Hannassay, the real feud between the two old men is shown to be unimportant, it isn't about the water or survival, it isn't about anything but hatred.
The third fight was McKay/Buck. No distance shots. Also, it's interesting that
McKay doesn't hesitate to fight this time. One can argue that "ha, he'll fight for Julie but he won't fight for Pat". I don't buy it. I see this as McKay recognizing that Buck is a real threat this time, to him, to Julie, and to furthering the larger war. From the characters' expressions, I don't think either Julie or Jim have admitted to themselves they love one another until Rufus points it out.
That fight is significant in that we have one of the major protagonists(Rufus) find redemption. Here he shoots and kills his own son, and goes to fight the Major solo, demonstrating the true strength of character he had. This scene tells me that the rivalry between Rufus/Henry was caused by Terrill alone. Yes, McKay chastizes Rufus when he comes to Blanco('you had me fooled'), but I can't see where Rufus has been causing the friction, just responding to it.
McKay wasn't fooled, he saw Rufus for who he really was, but was calling him out for the current bad behavior.
It was all there, the major has "grand plans" as Pat says to Jim, and Rufus makes a point to him that he 'Sticks in his craw' at the party.
It is interesting, an aside, that while McKay is "afraid to be a showoff" by not riding ol Thunder or battling Leech in public, he shows no hesitation at all to stand up to the Major in front of everyone early on, and call him on his bull. Of the two patriarchs, Rufus has seen a great deal less of McKay than the major has, yet understands and knows him better.