Not that much to add to the reviews above.
With fine dialogue and acting of the two main characters, the episode walks with subtlety on a thin rope, humanizing the outlaw without asserting he does not deserve his fate.
Unexpectedly it is also a rather romantic story actually, with quite sentimental heroes - both the killer whose only defining desires are to see a last time his family and to die gun in hand as he has been cursed to live, and of course the ever chivalrous Paladin, caring for a worthy though doomed roughneck not much less than for a defenseless lady.