From a litigation advocacy perspective, it is unlikely you will be able to conduct actual negotiations via text. However, if you end up in mediation, remember that much of the bluster of the machiavellian, the manipulation of the psychopath, and the preening behavior of the narcissist will be eliminated when they are interacting with you not in person, but through the mediator.
Make yourself think concretely—not “what does that really mean?” but, “what was offered?”.
If you find yourself feeling threatened or charmed, remind yourself that the person embodying the dark triad is not in the room; give yourself time to step back and consider how to respond.
The reality of the dark triad character is that there is a large display of style but not much substance. When you distance yourself from their interpersonal impact (by texting, memorandum, or an interacting through an intermediary) they simply become bad people, but not particularly productive, persuasive or threatening people at that.
And when you have to interact in person, say in the courtroom—focus on being as likable, sincere, and straightforward as you can and trust that the jury will see your genuineness. The contrast will be refreshing for them. You are there to do a job for your client and that means advocating for them and not focusing on the malevolence of your opponent.
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