wowie, Mashiro just stroking his own ego HARD on an enemy they know next to nothing about. (he could hold his own, but still took a serious beating in process)
That's because he assessed their strenght before they activated the Datenseki stones, which the Japanese didn't know about. And he was kinda right, even with the stones they jobbed, so without them they're just not all that.
btw This is the best arc so far, loving the new characters. Just good old fashioned shonen, but without the brainrotey feeling I get from JJK and Sakamoto days.