[He turns his own on a moment later. Looking back at her is a pale man in his late twenties who is clearly unwell. His hair is dull and lifeless and he brushes it lightly away from his face for just long enough for it to be obvious that his left eye is entirely blinded.]

Hi. [And he doesn't flinch at the way she looks, at least...] I'm Mendelson.

[Despite his pallor and poor state of health his smile is kind, if small.]

As you can see... I may not be the best person to take advice from on how to handle possession, but I can tell you what it's like. It's been years now, for me.