After witnessing the kiss, story Alma seems to reopen the door:
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. Behind her in the room lightning lit the window like a white sheet waving and the baby cried.