This is according to the screenplay....
Ennis's breath comes slow and quiet, then he starts to gently rock back and forth a little, lit by the warm fire tossing ruddy chunks of light, the shadow of their bodies a single column against a rock. Ennis hums quietly.
Nothing mars this moment for Jack, even though he knows that Ennis does not embrace him face to face because he does not want to see or feel that it is Jack he holds--because for now, they are wrapped in a closeness that satisfies some shared and sexless hunger, that is not really sleep but something else drowsy and tranced--until Ennis, dredging up a rusty phrase from the childhood time before his mother died, says:
ENNIS: "Come on now, you're sleepin' on your feet like a horse. (pause) My mama used to say that to me when I was little..."
They stand like that for another moment.
ENNIS: "and sing to me..."
Ennis sings low, a childhood song, from some long ago memory.
ENNIS: " I got to go."
Gives Jack a little shake, a gentle push, and Jack stumbles ever so slightly in the direction of his tent. Stops. Hears Ennis's spurs jingle as he mounts his horse.
ENNIS: "...see you in the mornin'."
Hope this answered your question...
Such a moving scene. It makes me lose it every time.
Kerri