[So. Elsa was... kind of a jerk to this man last time they met. Not entirely her own fault, she realises, and she's not about to blame herself 100% for what this world does, but even so, she... has a bit of a history of being a jerk to people and then not talking to them about it. Trying to change that.]
There was an... incident some time ago heavily involving vampires. Fabricated memories and knowledge might only count for so much, of course.