The difference between old people burning trees themselves and Mei Xiaolan Shen burning trees.

She'll be unhappy if she burns it herself.

Mei Xiaolan Shen said that there are still many beautiful things worth preserving in this world. I think burning trees is just for the protagonist to practice the law. The protagonist must be epileptic to set himself on fire. This is not just burning trees, but burning the world. That's why May Xiaolan Shen finally wants to kill the protagonist. I don't remember clearly, but it was said in the game. Of course, there is another possibility. May Xiaolan Shen's natural mission is to burn trees. To this end, she has studied the wind and fire posture for hundreds of years and considered practicing it thousands of times. As a result, not letting her burn is like depriving a person of his childhood ambition.