Kiro didn't intend to kill him quicker, he wanted him to remember to think the next time he challenges people because he fet like it.
He wanted to remove the chip on his shoulder that made him feel important, like everyone and the world owed him everything.
He was using the poor guy as a sandbag. He was still resistant, occasional throwing of punches here and there and trying to avoid Kiro's attacks. But he was too slow to succeed in either of the two things.
"Oh wow so you need to be fast to beat opponents that are slow and all muscle heads."
"You always say the dumbest things. Of course being just fast isn't enough, if he wasn't strong his hits wouldn't be making such great damage." The smart of the two commented, admiring Kiro all the same.
He was naturally right. Kiro was faster and stronger, the great giant couldn't hope to keep up. Though this didn't make him want to work on his speed.
