Before the battle, Klaus was expecting an intense fight—one where his side would have to do everything they could to win. However, he was shocked when that didn't happen.
In fact, it was after observing the first ten minutes of the battle that he finally understood something the senior had always been telling him.
He told Klaus his strength alone wasn't enough. The strength of his friends, loved ones, and team was the only way he could win all the battles that would befall the earth.
Now, Klaus saw what he meant, and that alone gave him the freedom to casually walk into the Abyssal Trench to face an Ancient King and his right-hand man without worrying about his team on the outside.
"The offer is simple: Hand over the trident, and I will make sure your death isn't as painful as I initially planned. Refuse, and I will ensure you go through a world of pain."