If Ye Qing were to interfere with the competition, not only would that affect his reputation, but Shen Jue would also lose his foothold with the other herbalist.
Ye Qing did not mind consequences to his reputation, but he did not want to destroy Shen Jue's future path as an herbalist.
"Let's see how the situation goes." Ye Qing was also somewhat helpless. Even though he believed in Shen Jue's talents, he also had reservations about the destructive detrimental potion.
He had decided to save Shen Jue if he could not endure the damage caused by the detrimental potion, even if he had to forgo the reputation that he had built for so many years. It was more important to have Shen Jue healthy and hale.