Li Ning urged Xin Ru to turn back before it was too late, but Xin Ru couldn't take his words to heart, especially since Li Ning called her senior sister, which displeased her even more.
In Buddhism, monks and laypeople universally refer to each other as brothers and sisters without a clear distinction of hierarchy. Laypeople address monks as 'Master' regardless of whether they themselves have a Dharma name or not.
Li Ning was a disciple of Bai Mei Zen Master, and there was no clear hierarchical difference between him and Xin Ru's lineage, so calling her senior sister wasn't wrong.
But Xin Ru considered him a junior; daring to call her that was an impertinent offense.
Disregarding whatever Li Ning said, she directly manifested her Wrathful Incarnation from the void.
