Though they didn't know Kent, seeing him toss two ingredients into the cauldron at the same time caused them to widen their eyes.
They knew alchemy to some degree, so they understood that extracting the medicinal essence from the herbs was the first step in achieving the goal. Of course, they also knew it was absolutely imperative not to make a mistake at that stage.
If Kent were to make a mistake at the beginning, the pill would come out damaged or incomplete. Extracting essence from two different ingredients simultaneously was simply too reckless.
However, they all knew people who could do that. One of them was the Pill Princess, who dominated the pill world before she was invited to the sect by the Pill Empress herself.
She was able to do what Kent was doing—extracting essence from multiple ingredients simultaneously. It was something just too shocking.
