Key

The group remained there, with nothing to accompany them but the rambling of the Evil Spirit that's currently possessing Shen Bao's body. Unable to coordinate or utter a single bit of concrete words and reasoning, it was nothing but a soulless body. 

Though it had a soul, it was severed from the main body, a soul with only its existence, without its memories or experiences, without anything but the feelings of pain, agony, frustration, disrespect, condone, and more vile and evil feelings.

Shen Bao had been exerting and extracting all of the vile emotions inside him and stuffing them inside this puppet to save his sanity from being corroded while he was trapped by servant Mao.

And this thing was the result, while Shen Bao was present, it was still linked to him, and he could easily possess and control it. But now, unfettered and unable to think for itself, it acts only upon the vileness that ha happened to it, and thus it went for Master Rain's throat.