This is the problem with inflexible rules. You should congratulate them on their outside the box thinking to both help an injured runner and outrun others together. At least ascertain the circumstances before disqualification it nothing else, judgement was too quick and not informed.
So, while you constantly see shrimpy blonde girls carrying people on their backs like it's nothing in mangas when it's a dark-haired girl the mangaka wants to be realistic and show that the sort of thing isn't something you just do as if it's nothing. Okay...
Senpai has come far. In chapter 1, a freshmen girl made him cry. In chapter 57, his harem carried him for the last half of a marathon while trying to beat the club prez dressed in a skimpy bunny outfit. Cute girls in every direction, plus one underneath. He's made it.