In truth, when it came to this round of the Heavenly Emperor riding a horse, Yao Guang was nowhere near as capable of controlling the situation as Li Qingjun.
Li Qingjun had pinned Qin Yi down for two and a half years... Yao Guang had not even held him for the time it took two incense sticks to burn. As Qin Yi kept struggling, trying to break free of Time Stop, Yao Guang remembered that she was currently "Li Wuxian playing Yao Guang." Naturally, she would not possess the real Yao Guang's command over time. If Qin Yi struggled hard, then to act convincingly, she had to let him break free.
Then... as everyone knew, she was weak and limp at the moment too, and could not be bothered to spare the focus to think further. So she simply went with the flow and let him break free.
The moment Qin Yi broke free, however, he flipped over. He who rode another would forever be ridden in turn; utterly unable to resist, she was instead made into the Heavenly Emperor beneath Qin Yi.
Qin Yi panted, his heroic vigor surging. "Rebellion, are we, little girl? You actually dared to Time Stop your master."
Yao Guang covered her face. "You were the one who told me to play her. Of course I had to make it believable."
Qin Yi whispered into her ear, "Then... say 'I am Yao Guang' for me."
Yao Guang: "..."
"What, weren't you always delighted to see her make a fool of herself?"
"Mmm... I-I am Yao Guang." Yao Guang turned her head away in shame and fury, so mortified she wanted to die.
Li Wuxian listened speechlessly as Yao Guang was forced to say countless unspeakable things in Yao Guang's identity—things like "Yao Guang is dying"