rom the screenplay:
Alma: "Don't try to fool me no more, Ennis. I know what it means. Jack Twist?"
Ennis: "Alma...."
Alma: "Jack Nasty. You didn't go up there to fish. You and him...."
Ennis grabs her wrist and
twists it.
Ennis: "Now you listen to me, you don't know nothin' about it."
Tears spring to her eyes, she drops a dish.