"Don't move."
Ectomy could probably have managed an introduction without the whole "holding him at gunpoint" thing. But, her intel said this guy was some kind of cop- the longer she could keep him still without calling for backup, the better. That, and she found that she was roughly 20% more convincing in conversations with a gun involved. It was simple efficiency, at this point. All social interactions are about efficiency, right?
"I'm here to talk business, and that's it. No one has to get hurt here. Got it? Now. Word on the street is that you're that cop who can see ghosts. I don't know if that means you're dead, cursed, or what, but you're going to follow me into my next scheduled haunting, help me run things a bit smoother. Understood?"