Well obviously, he can do that, seeing as he just did, and all. People say the dumbest things.

It's good to see Koshi up, since it means he hadn't been blustering about being tough. That, and it got the other hand disabled for the moment, which means that the U-Man can't block the sword hilt to the gut that doubles him over. And that leaves his head in good range to either of the two kids if they want to take advantage of that.