Integra: Alucard? What’s going on?!
Alucard: I think we’re causing a paradox. If Wells succeeds in killing Van Helsing, you won’t be born.
As long as we don’t stop him, it gets more likely that he will succeed — and you get closer to birth. If he does succeed, your birth will reverse, and you will vanish.
Integra: No, I mean — why are you a girl?
Alucard: You did say that this was the ladies’ room.