Proulxfan, I don’t disagree with what you feel here (brutality), what I was nodding to thomas about was the sweet/sour nature of the event. Annie did it (typically) very well and succinctly:
The door opened again a few inches and Alma stood in the narrow light.
What could he say? "Alma, this is Jack Twist. Jack, my wife, Alma." His chest was heaving. He could smell Jack, the intensely familiar odor of cigarettes, musky sweat, and a faint sweetness like grass, and with it the rushing cold of the mountain. "Alma," he said, "Jack and me ain't seen each other in four years." As if it were a reason. He was glad the light was dim on the landing but did not turn away from her.
"Sure enough," said Alma in a low voice. She had seen what she had seen.
IMO this was fleshed out in the movie, broadened into the two scenes much like Alma’s role in general. I’ve felt the “what could he say?” was developed into Ennis’s leaving scene the next morning when there wasn’t much more he could say that wouldn’t be just lies anyway (something Ennis wasn’t good at). In the SS he does it over the phone, ouch! I don’t feel Ennis yet knew where “this thing” with Jack was headed. How do you say it’s over? Fifteen years later when Ennis was being torn apart by the relationship with Jack he had a virtually breakdown when trying to verbalize it. Maybe he could sense in Alma the “vibrations” that she knew what was going on here with Jack and in typical Ennis fashion he just wasn’t ready to accept it himself so tried to ignore it. She knew what she knew.
To me the combined scenes drive home the power of the "hot jolt" that seized Ennis upon the reunion. He was blinded by his emotions (again) but this time by his love of Jack. He did not see what it was doing to Alma. Like his physical outbursts, he became focused on a singular issue (Jack) to the exclusion of all else. IMHO