Plot twist, getting bitten by a vampire actually makes you crazy in the exact specific way that inconveniences said vampire. This is the true reason why vampires are banned from biting humans.
"Hark, a conundrum will unfurl"
"For I would not kill a sparrow"
"As I ready my bow and arrow"
"You see, I'm an upstanding girl"
"I live on the straight and narrow"
"But today I'm feeling...naaaauugghtttyyy"