Although Yan Ming is a Great Witch skilled in divination, he has also studied pharmaceuticals somewhat. Seeing so many herbs, he couldn't resist jumping down from the bramble wall to examine them closely.
Upon this inspection, Yan Ming spotted Shuangshuang picking herbs—it was quite the coincidence, as she had recently been researching a new medicine to treat epidemics.
Epidemics are severe in the Beastman World; when one arises, it results in a whole tribe dying. Not long ago, a medium-sized tribe with over three thousand people not far from the Silver Tiger Clan was wiped out by an epidemic.
The news was brought by a passing beastman, and at that time, Shuangshuang was already considering the necessity of developing medicine to treat epidemics.
Of course, the medicine for treating epidemics isn't a cure-all, since the symptoms of epidemics vary. Shuangshuang merely developed medicine for the most common ailments.
