Ye Qingci noticed something amiss and struggled to ask, "What exactly have you done to him?"
During the battle with Long Xuan, Ye Qingci was supposed to be too preoccupied to pay attention to anything else, but the Dragon Slayer's odd actions still brought to her attention the situation over there.
Having had some contact with Yihe Jiugui, she was sure that this fellow wouldn't make a move without absolute certainty and sufficient benefit to drive him.
That's why she made a decisive choice, unleashing that sword of illusory and real fusion, solely to take Su Chengyu away.
But... it seemed she still underestimated the schemes of the obscured Yamata no Orochi.
The sudden appearance of Yamata no Orochi, blocking Ye Qingci's path, evidently had accounted for this surprise in its calculations.
What Ye Qingci couldn't understand was why Yamata no Orochi's target wasn't her, not Long Xuan, not anyone else here, but Su Chengyu.