but however your self confidence cant be ruined, be aware , no matter how hard situation or period is, stay on your feet , its vital part of your personality.
If the Narcissist see's you as a threat, it's means you will be their next target. They will do their best to break you and turn you into an empty shell.
Sometimes it's just fun to let people think they've gotten away with something. Then you can always hit them with something bigger.