One of the most enigmatic lines in the screenplay elaborates on the following section of the short story describing the 'embrace from behind':
"Stars bit through the wavy heat layers above the fire. Ennis's breath came slow and quiet, he hummed, rocked a little in the sparklight and Jack leaned against the steady heartbeat..."
In the screenplay, Ennis whispers to Jack a rusty but still useable phrase from his childhood memories:
Ennis to Jack: 'Come on, you're sleepin on your feet like a horse [as my mother used to say] ...and sing to me...' {Ennis then hums a half-forgotten song in Jack's ears...}
Before reading the screenplay, I had already watched the movie a couple of times. During those couple of times, I had a vague sense that Ennis was whispering something to Jack, but could not really make out what this was all about.
This quiet whispering, at the very dead center of the entire 'embrace from behind' scene, struck me as perfectly beautiful and peaceful, without fully understanding what that part was all about.
In fact, I have doubts that Ennis/Ledger ever did say the words 'and sing to me'. If he did, it was so quiet that most viewers (myself included) probably did not catch it.
Upon reading the screenplay later, I was floored to realize that the middle of this entire scene was a sort of lover's lullaby!
I can't describe how this impressed and moved me.
Just wanted to share this with everyone...