That's the thing; just as Kento said, we don't know for sure . Did Vegeta get hit by the attack that nearly took down Bardock?
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"To all visitors from Transylvania looking for the head of Voivode Dracula: Yes, we have it. Yes, he's dead. No, you cannot see it. No, he will not return and invade you again. It has been over thirty years, please stop pestering us."