It will help if you bring them down in your own mind. I usually call them "sheep" because they are herded by the narcissist and made into props, tools that the narc uses. I literally humiliate them in my own mind by revealing how they are self projecting their own flaws and unconscious hang-ups unto me. You have to be an investigator or psychoanalyst of sorts. Then you don't have to endure the feeling of being overpowered and therefore being retraumatized over and over again. The feeling of having power is the key to bypassing trauma in this situations. Read books, watch movies with characters that are indolent, rugged and rebellious to learn how to do that, because I had to learn the attitude from others. I used to be a doormat. Now I am still being bothered by Flying Monkeys but I found the key to overcoming it: iconoclasm. Give them a taste of their own medicine, bash their image, mock them, force them to see what they are.. You can get a little bit narcissistic, and they may use that against you but anything trumps being retraumatized. And reaching the point when you are in physical pain from the constant abuse is not a good, you'd rather be a narcissist for a little while until it's over. By the way, there is such a thing as healthy narcissism.