Ever since the appearance of Victor in the lives of the vampires, they had been searching for a way to get rid of him. Searching would actually be an over statement, as they pretty much already had a way to do so. The only problem was that, it wasn't as easy as just putting two and two together.
After Victor humiliated the vampires and showed his power, to which the vampires were unable to fight against, the elders and the vampire lord made up their minds and settled on a plan, and that was to call upon their ancestor. The only problem with this plan was that it wasn't quite possible as they weren't in their world.
Therefore, to achieve their goal, the need to speed up an already ongoing project rose, and that was exactly what they did.
Maybe ultimately, it was Victor's fault for not being careful enough when it came to the vampires, and that was why the project could go on until completion without him knowing, but he couldn't be blamed a hundred percent.
