From the Super Mario Wiki
Vampires start out all tied up and highly vulnerable to punches. They can, however, execute a fast spinning attack in this state. If Wario stuns and Piledrives a Vampire, instead of being defeated, the enemy grows more powerful, shedding its bonds and throwing the locks that once imprisoned it at Wario. It takes another Piledriver, Wild Swing-Ding or Mega Toss to defeat the Vampire permanently.
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