I mean that you would have the strong feeling of having met someone with a very distinct and often quite prickly sense of who they were in the world. Most people aren't like that: they might or might not have a robust private sense of identity, but either way they mostly prefer to rub along with others without standing out too much. Imagine wanting to be thought of as "intimidating"! If only so that you then have occasion to say to people "don't worry, I'm not intimidating really, what, little old me?", knowing full well that they find you very imposing, if not actually terrifying. But the source of that isn't pure narcissistic self-importance (although that can be a besetting vice), it's having gifts that you're not comfortable with and don't know how to control.
This is really good and true of that coterie.