you need to say "up" jump run and not "on" jump run. in discussions like this being precise helps. :)
i read the reddit thread. i'll echo what remster said, in a breakoff, your #1 job is to get separation from your group-mates, and often that means a few people are tracking up and down jump run. group exit intervals should be designed to take the fact that some people from both groups will be tracking up and down jump run into account.
now once you are in the situation the reddit poster described, you are in some trouble, and what you do is very situation dependent. pull early, alter your track direction, stop tracking and wait, lots of options and i can't give any advice over what to do but be aware of where everyone is and do what is best to keep away from them all.