Just as Lin Bai said, Yuan Qing had indeed been waiting on the side for a long time.
When Liu Tian arrived at Shadow Mountain, he first went to greet Yuan Qing, and then Yuan Qing followed Liu Tian, one after the other, to Lin Bai's residence.
However, when Liu Tian cried for help, Yuan Qing did not take action to save him.
What good would saving Liu Tian do?
After all, Liu Tian came to kill Lin Bai, and taking action first to kill a fellow disciple within the Sword Art Academy was originally against the rules.
But once Lin Bai killed Liu Tian, then Yuan Qing would have a justified excuse to take action against Lin Bai, after all, even if Liu Tian was wrong, he was still a low-level Elder of the Sword Art Academy. No matter how great his sins, Lin Bai had no business dealing with him—that was a job for the Enforcement Hall.
And Lin Bai killed an Elder, and no matter how great the Elder's faults, the fact that Lin Bai killed someone stands!