For you, your friends and family are people you care about, share things with and turn to for support. For the narcissist in your life, they are pawns to “win.”
The narcissist doesn’t try to win over your friends because he likes them and wants to get to know them. He goes after them because he wants to take them from you. The narcissist will charm them long enough to use them, then he will ignore them. Your friends are only puppets to the narcissist.