Werewolf and vampire myths were common in Hungary. It’s not surprising that they these myths would cross.
If a werewolf ever consumed the flesh of and executed person when he died he’d raise as a vampire revenant called Farkaskoldus.
It rises from it grave at night, it can shape-shift into a cat, dog or goat, which allows it to move through town discreetly. While it looks for a victim.
When he finds his victim he lays on top of the victim, drains his blood and returns to the grave before sunrise. If a deceased person is suspected of being a Farkaskoldus, its grave is exhumed. If there’s merit in the suspicion the corpse won’t be decomposed, the scent of death or decay, the body will also be full of fresh blood.
There are a few ways to destroy a Farkaskoldus. The simplest is to burn the body to ash or soak it in holy water.
The next level if it’s felt a more severe method is needed, a stake must be driven through the heart or a nail through the head, then burn the body to ashes.
The most extreme is to remove the heart through the vampire’s back then burn everything. The ashes must be gathered in a sack and thrown into a deep river.