This guy I knew & worked with was charming enough. He was far and away the best salesman I've ever met.
One time I watched him do something I cannot account for. He had an older lady at his desk (he particularly appealed to older lady clients). She pulled a cigarette out of her purse -- this was back in the days when smoking was allowed.
He was *not* looking at her. He was looking at his computer, which was in approximately the opposite direction.
Without skipping a beat, he pulled out a lighter and reached over and lit her cigarette.
I have thought of that many times. I've wondered how he could possibly have done that. I even checked the reflections from his computer screen.
It is not possible. No one could have done that. But I saw him do it.
The only explanation I can think of is that psychopaths like him are capable of getting well inside the minds of other people. Much further than most other people could ever get. That is why he was such a good salesman. He *knew* what individual people wanted to be told. It wasn't a matter of sales pitches. He could feel them. He knew what they were thinking.
He was a very dangerous person. You wouldn't want to be around him.