Rishi did as the professor asked him. He first forgot about all the hate and revenge, and then he imagined himself as a tree that only provides for other beings. The enhanced focus of Rishi activated, and he started to release a peaceful presence.
He then started to release a kind presence, and before he started thanking everyone that helped him in his life, he also started thanking nature for making it possible for others to survive.
When Rishi started doing it in an extreme-focused state, he unintentionally hypnotized himself.
He started believing that he was a tree and that his job was helping others. This process led to the life force present in nature getting attracted to him.
The presence he was released, combined with his high charm stats, made his belief even stronger. The green mist started appearing around Rishi, and he started to feel that there were uncountable living particles surrounding him.