Hellstone

The two enter the apartment. Dan asks if the stone on the floor is Robert's. Robert is confused, and so he picks it up to show him. But, as soon as Dan picks up the stone, he disappears. Robert, confused and bewildered, walks over and picks up the stone. As soon as he touches it, he picks up talking where Dan left off before his disappearance. It soon becomes apparent that the stone is somehow capable of body switching. They decide to interrogate the guy next door for answers. Before they leave, Will makes sure that Robert is in his own body, to try and eliminate any ownership confusion.