Fang Zhou did not use the Celestial Stars Sword because that was an upgraded version, and he feared Yun Zheyue wouldn't recognize it.
The Dayan Star Swordsmanship and Moon in Water complement each other, but learning them requires a certain threshold.
Fang Zhou wasn't sure if Yun Zheyue knew these, but he presumed she must have seen them before.
Sure enough, as soon as he used it, Yun Zheyue immediately blurted out the spell's name.
She looked at Fang Zhou in shock, her voice trembling: "How do you know this spell? What's Ling Xiaoyue to you?"
Fang Zhou sneered, "I know this spell because I'm Ling Xiaoyue's disciple."
Yun Zheyue felt the world was so magical, having thought she was cornered, but unexpectedly, this terrifying enemy was actually her junior brother.
Her tense heart relaxed all at once, and she quickly said, "I'm also Ling Xiaoyue's disciple. Did she tell you? Where is she now?"