AF quest has nothing to do with the Asuran Fist quest. Have you gotten your AF Weapon, Beat Cesti yet? That's from the Ghosts of the Past quest, which starts the entire AF line. Chances are, you probably have that flagged already and just not finished it. You can always check wiki and your current open and finished quests to see which AF Quest you have flagged already to see what you have/haven't done.