Do you think that...MASSIVE SPOILER
...they both died there in the desert, which I kind of feel represents a kind of purgatory (I get the impression from the film as a whole that it is meant to be seen within a religious context, especially as they both strike a deal with Louise C Fair there!) and that they both find redemption there (exonerates the bowels!?! :)) The last shot of the film with the two of them heading back to the mountains, representing Heaven if you are to take that interpretation from earlier in the film, seems to confirm this for me.
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