"It's over."
The turtle screamed in pain as it flung its head for the sake of removing Kai from his head.
Noticing that the turtle had yet to die, he gripped his sword even tighter to hang on until the turtle died. But the latter seemed to be more powerful than he thought. Despite waiting for half a minute, it was still pretty energetic, making him wonder if he missed his target, the brain?
Since it didn't die, Kai continued his second plan. Due to this swinging head, he pierced the head once more with his other sword, so he could slowly walk to its neck like playing a ski.
It was a bit hard, but Kai managed to reach it half a minute later. He pulled the sword in his main hand and swung horizontally, cutting the turtle neck with his Sonic Sword until the head fell off.
He then leaped on the turtle's back to avoid being launched and watched how the turtle died.