Wu Pifu stayed safely inside the base for the night, planning what he needed to do next.
First, if he wanted to return quickly, he had to kill The Fish and The Butterfly. That was mandatory, with no way around it. According to the Bodhi Fruit, if he failed to achieve this at this point in time, he would have to go to other points in time that had been altered by The Fish and The Butterfly—times that did not originally belong to him, yet might also belong to him. For example, becoming that monkey, or perhaps he had always been that monkey...
But if that happened, The Fish and The Butterfly would become deeply involved in the fate and karma connected to him, endlessly altering events that had already happened in Wu Pifu's past. He had no idea what drastic changes each alteration might bring to him. He might even be completely transformed into a different person.
It was incredible, but it could very well happen amid the entanglement of two true ranks. To true ranks, the life, fate and karma, even the anchored essence of life of a mortal like Wu Pifu were all meaningless. If not for the Bodhi Fruit protecting him, he might not even be able to maintain his sense of self.
So he had to kill The Fish and The Butterfly at this very beginning.
"Large numbers of living things need to die, or nonliving things need to die."
After experiencing the contamination scenario in the arena, Wu Pifu knew what he needed to do next: take part in those contamination scenarios in large numbers. The mass deaths of intelligent life in this world could accelerate the anchoring, but destroying the contamination-spawned monsters within those scenarios could likewise accelerate it.
This also indirectly proved