To Liu Hongzhao and the others, finding clues is equivalent to completing a big step toward their goal. In these two hundred years, they have found no clues while searching for Zheng Yichen.
In Tianhe, apart from the Evergreen Eye left behind by Zheng Yichen, there is no trace related to him. Outside Tianhe? They previously didn't have the condition to leave Tianhe.
Now, they have caught a good start. In a first meaningful act of sabotage, they discovered important clues. What's wrong with that?
Qi Xiangyun explained her plan in detail. She certainly wasn't intending to sacrifice herself to deal with the Thunderstorm Land. She was not willing to do that.
As a practitioner of magic power, while being extreme, she also wouldn't be moved to do certain things because of her extremity. She would only use more extreme measures to achieve her goals.
