The livestock at the base, such as cattle and sheep, need to graze.
The stockpile of hay has been consumed and now they are eager to be fed.
Pigs are easier to keep, as they would eat just about anything, but cattle and sheep pose more of a challenge. So under these circumstances, Li Yu led some people into the mountains to pull some grass and bring it back to the shed.
The rainstorm is too intense; once the livestock come out, there's a risk of them causing a commotion and potentially running amok in the base which would just add to the trouble.
Upon reaching the mountain forest, Li Yu and the others discovered that the pasture had grown incredibly lush; the rainstorm not only didn't drown out the plants but actually seemed to promote their vigorous growth.
Xiao Laotie followed behind, going to cut some pasture grass as well.
