Rewriting the vampire rules
So Maria is bitten by Dracula and blood is consumed. Two puncture marks on the neck but she didn't die or become a vampire.
shareSo Maria is bitten by Dracula and blood is consumed. Two puncture marks on the neck but she didn't die or become a vampire.
shareThe victim needs to die before they can become a vampire. But when they have drunk from the vampire's blood, the vampire needs to die for the curse of becoming one to break free (though I'm unsure if Maria really did drink). It wasn't the first time Dracula fed and didn't kill his victim right away but planned to come back a second time. He did it with both Lucy and Mina in the original, and he also didn't kill Zena in this movie when he first drank from her.
shareIn Dracula (1958) Cushing's Van Helsing states outright that vampires can't turn into bats. Two years later in The Brides of Dracula he says (and we see) that they do.
The rules get rewritten to suit the story they want to tell.