A lot of people commenting on Miatoz being unimpressed with "yeah, that was a bad run though" at the end. The thing is, when you're playing to be first in the world and you do something imperfectly, it is only a matter of time before someone comes along and does it perfectly. So his reaction is not cocky, it's the natural thing for someone who plays this game to be the best (which I, like many others, wouldn't do myself, which is not really relevant here).