You can excuse yourself from an argument that they have started and walk away at any time in the relationship.

I have used this many times and it is very effective if you are in a situation when you have to be around them.

The key thing is not to dominate them; they only get angry if they feel as though you are trying to assert your control.

If they are screaming, and you say "I have to go and do some work now," and then you leave, that is control over yourself not them.

Narcissists are abusers and you can't talk to them like you would a normal person.

So you can't say "Stop doing that, I don't like it" or "If you do that one more time I'm leaving," because they will get violent or abusive since you are telling them how to behave.

We have a lot more power than we realise, but to tap into it we must talk to these people from a place of self control.

Narcissists know this too, and that's why the first thing they do is to make you start reacting instead of responding, which destroys that self control.