How do you handle it when your partner involves outsiders, like the police, in a personal disagreement that's not serious?

What signs indicate that a narcissist is starting to lose interest in provoking you, and how can you sustain this progress?
How do you balance honesty and kindness when speaking your truth during tough conversations with your spouse?
How long does it usually take for a narcissist to give up when you stop reacting, and what should you expect during that time?