Mina: "Alright, everyone pinkie swear right now to put Vampire Me down if I hop the line between death and undeath."
Van Helsing and the Suitor Squad: "Depressing, but sure, absolutely."
Jonathan:
Mina: "...Jonathan?"
Jonathan: "Yes?"
Mina: "Will you promise to slay me if I get vampire'd?"
Jonathan: "Mina, I will not lie to you."
Jonathan:
Mina: "Jonathan. I need you to look me in the eye and promise to murder me martyr-style if I get too undead."
Jonathan: "Fine. I can promise to kill."
Mina: "Me? Vampire me?"
Jonathan, making unbroken eye contact with the four guys who just promised to behead and impale his wife if she stops being human enough: "I guarantee there will be killing involved if Vampire You happens."