Charles Delaware Tate, desperate to retain the talent (I’m fed up with referring to it as his talent), became a devoted slave of Petofi, willing to assist him even in murder - or anyway, Tate was devoted until it looked as though he himself would get murdered. Pansy, on the other hand, was apparently willing to die so that Quentin might retain his beautiful body.
I can't remember whether or not Julia told Petofi that Barnabas's body had disappeared in 1969. But if she didn't, then Barnabas could have told Petofi because I’m quite sure that Julia told Barnabas, and then Petofi would have known that Barnabas's body was not exactly the desirable residence he was seeking.[spoiler]It seems possible to me that the Leviathans caused the Kitty/Josette phenomenon in order to pull Barnabas back to 1795 where they could take control of him and send him to 1969 to do their bidding. If that is the case, then the Leviathans might have been surprised if they had landed Petofi instead of Barnabas.[/spoiler]
It seemed to me that Petofi should be able to control Garth Blackwood with his hand, but I guess I was wrong. I like the idea that the hand (the extent of whose powers Petofi was unaware, as he himself stated) was what created the being that could destroy it.