Followers who take NPC levels (meaning all non-combatants) they get double levels in each tier. So example 1st level followers who are counted as non-combatants could take 2 levels as experts (or warriors albeit they would focus on profession/craft somekind still). All followers which count for combat/battlefield purposes can take double levels as NPC's still or take PC levels (like Knight levels) instead.<br/><br/>Also when or when not your aware when save failed depends on situation/abilities used.