Why Did the Narcissist Suddenly Erupt?

#narcissist #narcissism #hgtudor
All is well in the household and then the narcissist launches a fierce verbal tirade at you.
You are sat at dinner with the narcissist and then he insults you and then storms off.
Why does the narcissist go from calm to eruption in the blink of an eye? What causes it? What part, if any, do you play in this? What is the point of it?

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