Let me hasten to say that had I made such a deal, I wouldn’t have broken it.
But shouldn’t the author have assumed that his competitor was playing mind games? If I understand correctly there are no rules against deals like this. And I imagine there are no rules against lying to your competitor.
I would feel if I were in the author’s place that I had allowed myself to be taken advantage of, that I had trusted a competitor, which is generally speaking not a good idea in a race like that.
It seems to me this is the author saying he trained physically for the race but got hoodwinked by someone he by nature should not trust.
Or is there something about the subculture I’m missing?