You know you and your friend are having too much fun when you don't even show up in the picture, amirite?

But they are right there

At that point it turns into a test of will and thirst to survive. If they didn't appear in the picture; they are obviously a vampire. Luckily I always carry my wooden stake... wouldn't be the first time this has happened. I suggest you go to their house now and finish them off here and now. Also don't be afraid when they don't burst into flames but instead just kind of bleed and scream; apparently they don't burst into flames. Good luck!