I was researching "real Vampires" and came up with an article.
Here is the link if you want to just look at that.
Real Vampires
"Spirit-Influenced" Vampires:
These are, no doubt the most frustrating cases to study because they differ so widely. In the one case I have been able to study, the vampire
was involved in demonology and either erred or made a pact he later regretted. It seems that certain "spirits" or "demons" can give people
some of the characteristics of other types of vampires in exchange for partial possession. The new vampire then has certain enhanced abilities
and, in exchange, allows the spirit to take over now and then. At first this almost sounds like a form of symbiosis, but the human in the deal
soon finds that the spirit usually does things that are morally unacceptable. He seems to be in a constant state of remorse for the things he's done.
He wouldn't go into details, but he did hint at murder. Also in this catagory are the vampires who claim to have been changed by a visitation
in a dream or by the apparition of a ghostly vampire. Cases in this category are documented in the book _Vampires_Among_Us_ by ???????.
I have not personally met any such vampire, but I have met people who were visited but not changed.
Aren't these the vampires he was talking about?