Every time I screen the film, there are a few special seconds of Ennis that grab me most....
When Ennis is cleaning the pots and pans in the stream during one of their first mornings on BBM, he stands up and looks up to the mountain, sees Jack as a spec of black on the mountainside, and then the camera goes in for a close up on Ennis' face.
His expression of wonder, yearning, loneliness, semi confusion, fate, and innocense is grippingly sensational. In that small scene, he has a similar look/appeal of Brandon deWilde in Hud; interestingly characters cut from the same cloth in many ways.