No need to apologize at all! You are correct - when playing Forged in the Dark games like CBR+PNK, you don't roll for NPCs. Instead, challenges show up as consequences for the player rolls. The Hunters work as a way to clearly frame and guide these consequences!
Their skills are ways to affect the players approaches whenever they're in play, making some actions more threatening or less effective, or providing a few complex obstacles players will need to tackle (in the form of progress tracks). Basically, when a Hunter is in action, they make everything tougher for the players until they're defeated!
Hope this cleared things up, but let us know if there's anything else we can help with!