Espionage.

Shi Lang waited silently on the tree. He wanted to see what the old man would do. He stood at the bank of the silver mirror lake, gazing at the wilted Tulip with a fervor. However, his vigilance was not low. He stepped on the surface of the water and walked ahead. Shi Lang could not help but raised his brow and said, "Seems like he has used other methods to heal his injuries." 

The two ghosts looked at each other and asked, "What do you mean to say?" 

Shi Lang replied, "According to my information, the target was looking for the nine-leafed golden lily. However, I later discovered that legendary beasts guarded the lily, and humans could not claim it. As for the usage of this herb, it was to heal the damaged meridians.