For some crazy reason I thought they were going to get into the MMA octagon and duke it out with fewer rules, which I perceive to be a "purer" sport than boxing (yeah yeah, I'm a young-un etc)

If McGregor is entering a boxing ring to fight Mayweather's game, he's gonna get walloped. In my assumption that Mayweather was learning MMA, I thought "hey this will be an interesting fight". But if Conor thinks he can purely box, he's gonna go home in a pine box.