One reason I think it's interesting to think about is it's making us (or me) characterize different levels of improbability not normally dealt with day to day.
Is it strictly impossible for the 1300 to win? No. But as long as their play is characteristic of their ratings it's also, I'd use the word unimaginable, that the 1300 would win.
My initial USCF rating was 1250, but my first non-provisional rating was over 1400. An old friend of mine beat me in my first USCF tournament, but I beat him him more than fifteen years earlier when we were in high school. He remains in the 1300s while I have been over 1900. I recognize that some 1300s have skills, but they also have significant defects. Other 1300s are beginners on the way up. I was 1300 only when I was unrated, and until my second rated tournament. It is hard for me to imagine such unskilled players doing well against players who have clobbered me, let alone those who clobber those who clobber me.
My best OTB draw came after 40+ hours of prep for a match with a 2250 FIDE Master. I was mid-1700s at the time. My preparation gave me enormous respect for the skills of a relatively weak master compared to the skill of GMs, let alone super-GMs.