Narcissists live in a state of constant rage, repressed aggression, envy and hatred.
They firmly believe that everyone is like them. As a result, they are paranoid, suspicious, scared and erratic. Frightening the narcissist is a powerful tool for the modification of his behavior. If sufficiently deterred, the narcissist will promptly disengage, give up everything he was fighting for and sometimes make amends. To act effectively, one has to identify the vulnerabilities and susceptibilities of the narcissist and strike repeated, escalating blows at them - until the narcissists let go and vanish.