Just to be safe, I've been reading up on how to vanquish a vampire. Never hurts to be too careful. From what I've read, it seems that many authorities agree that the simplest and surest way to kill a vampire is with a wooden stake through the heart.
The concern that I have is, our Sages teach us (Kiddushin 49b) that
דברים שבלב אינם דברים
things in the heart are not things
and therefore, seemingly as soon as the stake penetrates the vampires heart, it will cease to exist.
So how can I vanquish vampires if my stake will stop existing?