The character must be well established, unshakable, even if he is a villainous scumbag; deep down, he actually prefers a more pure-hearted woman. Your cruelty is too much for him, and it will make him wary and prevent him from taking you to heart.
So, Qin Yu put on her act and took advantage of the moment of hesitation to reopen her blocked meridians and let the blood flow normally again.
Previously, Qin Yu had calculated the timing, deducing that the poison would take effect before the end of the ceremony, meaning she would have an incident in front of everyone. Such a disgrace, even if orchestrated by someone else, would result in the imperial court holding her accountable. Even a humiliated Lin Heng would have her executed in private, declaring she "died suddenly of illness."
Therefore, she could not afford to have an incident—that meant controlling the speed of her blood flow to slow down the movement of the poison.
