He vaults the picnic table, runs like mad, is able to catch only a single wrist, and pulls her up over the cliff where they both collapse, he with freshly damaged leg, she with damaged arm. And then there's a "screw it" paragraph that I guess is the point and can be interpreted how you like. I was thinking it was too "simple" a story of an upbeat ending until the final paragraph but, IMO, it rather clumsily avoids that by ending with the "where are they now?" which describes them getting divorced a couple years later and the foreshadowed companion of the backtracker ending up with the girl and the backtracker ending up alone. You could say this indicated that "love" is ephemeral or that love is so enduring that the guy's okay with saving her no matter the end result or you could maybe think he should backtrack again and maybe drop the other guy off a cliff
or whatever.
It was an interesting story with a neat gimmick, but a little
too gimmicky for me.
Anyway - don't know if there was any need for this post, but that's some of what occurred to me on reading it. If there were still fuzzy areas, maybe it helps a little.