[It is a boon that most people don't look closely enough at his eyes to notice that the pupils aren't like that of a human. Particularly as his eyes are not the bold, bloody red of a Fallen. But he doesn't know this man and doesn't know how observant he is or isn't, so he looks down, as if continuing his inspection of the device. Less direct eye contact means less scrutiny. Hopefully.]
I would consider both, truly. Even if they don't normally attack, a vampire is never not dangerous to those around it.