You guys ever notice how narcys use the same terms and insults that have been used on them in the past? It's as if they made a mental note like so:
>"Words that hurt people"
>"I know for a fact that they work because they hurt me"
One can train them like puppies. They become an extension of you. Nooticing this also gives you feedback on what things have injured them, if you just met them. They give you the blueprint on how to injure them.