The yellow-ranking spirit stone is in the mine, and the guards won't notice it because it's purple, not yellow. The workers are no better than the fifth-level of human emperors. The guards are too fast to catch the thief refining the purple stone, so they're going to have to search the whole place for him. The only way to find out who's refining the stone is to report it to the young master, and he's going to do it right away. He's sure the guards are after him, but he can't find him yet. He runs into the mine and hears a lot of guards approaching, so he runs back to warn the guards. The purple vines sound like they've just been attacked by a spirit energy. The monster is all, "Gee, it sounds like I'm going to run away from the guards and tell them what's happened." He then turns to the other side of the room and tells the guards that he came to save them. The spirit stone aura is stronger than any other human emperor's auras, he says, and this one is even stronger than the human emperor himself. He says he'll test his strongest strike on the guy and split his hand.