Just as he steps into the puddle he begins to feel like he's burning up and before he knows it he's drenched in sweat. He continues to sweat and before long he notices that his skin is actually dissolving as is his hair.
He struggles hard to get out of the goop but his muscles wont respond and he watches as his hands deteriorate revealing bone. It continues up his arms and eventually his liquified body has turned into the same dark goop he stepped in. Eventually the only thing left of Jim's mind and body is the skeleton which the goop is now going up and down almost like veins and emptying into his eyes.