Battles to the death are a stark contrast to battles merely aimed at suppressing the opponent.
As Maud said, if the battle between Klaus and Niva was merely to kill her, he would have achieved that much faster, though not as fast as Maud exaggerated.
But then again, his nine soul bodies hadn't even done anything just yet.
However, if Klaus were to employ all his strength in that battle, it would have taken him only 15 minutes instead of 45 minutes.
But since he managed to defeat her before time ran out, that also counted as a big win, and now Klaus could relish his win.
Defeating Niva had pushed him to his limits in the path of the flame. He never expected to even win just with that, but being pushed that far to the brink was enough to show that, facing even a medium-level Real Immortal, he would have to put in some work.
