Have you ever found yourself in a place where everything you ever learned is disputed by a person with far less experience and knowledge than you. Sure. But, has it ever been so extreme and the doubter so confident that is caused you to question everything you ever learned about your specialty. This person undermines and erodes every bit of confidence in your experience you ever had. This person moves you from expert to incompetent boob with a turn of a phrase or an unanswered email.
Under normal circumstances your time with this person would be limited. Perhaps one interaction and an addition to the never again list. But the skill here is so good it is weeks and months before the true nature is revealed. Perhaps you have decided this person would be a good boss? Perhaps, no, certainly this person is a psychopath.
Thanks for reading.