It should have ended like:
Llewelyn Moss takes out the Mexicans but is seriously injured in the massive gunfight. As he leans on a blood splattered bed, surrounded by dead Mexicans and bullets, Chigurh enters the hotel room dual wielding Captive bolt pistols. The two men size each other up. Chigurh holds both of his weapons at his side. Moss slowly reaches towards a gun on the floor, but instead picks up a cigarette mere inches away from it.
Llewelyn Moss
I forgot my lighter. Ain't that a bitch...
Chigurh
No, it ain't
Llewelyn Moss
It ain't what?
Chigurh
It ain't a bitch, friendo
Llewelyn Moss
How do you know?
Chigurh
How don't I know
Llewelyn Moss
What?
Chigurh
When?
Llewelyn Moss
Where?
Chigurh
Why?
Before Moss can respond a shot rings out, and Chigurh slumps to the ground dead. Behind him, Ed Tom Bell's revolver steams with smoke. He reaches into his pocket, unveils a lighter, and tries to throw it to Moss but misses him by two feet.
Ed Tom Bell
I'm too old for this shit
THE END