I just want to note a couple of things--not everyone who behaves this way on occasion is a clinical narcissist--suffering from NPD. Most alcoholics behave in narcissistic ways a lot of the time, which is not to say they are suffering from (or that YOU are suffering from) NPD. Alcoholics can make a lot of noise to distract everyone from the real problem--alcohol. With those people, sobriety and a good recovery program will eliminate the behavior. In those cases, too, detachment and staying calm is an effective response.
But when the rages are part of a pattern of abuse--whether alcoholism or NPD are part of the picture or not--"ignoring" the abuse may only cause it to escalate and may be dangerous. Sometimes "flight" IS absolutely the appropriate response. If your partner makes you afraid, please contact your local shelter or the National DV Hotline and talk with an advocate, who can help you assess your own situation and help you with any necessary safety planning.