of the Dark Knives. Even when Valen subsequently defeated Nershan in single combat, the leader of the Dark Knives rejected him and sought out the Shadows, offering the services of his clan to the enemy.
These renegade, or Shadowsouled, Minbari fought on long after the end of the Shadow War, and the Star Riders accepted it as their personal mission to suppress the traitors. They accomplished this, but at great cost. Centuries passed before they could rebuild their numbers, but during that time they became much stronger.
Vance also learned in his studies that over the centuries they built many traditions and rituals unique to their clan. The overriding theme of these was honour, duty and sacrifice. Vance could only see how this would stand against him. Surely Merreck was bound by honour to seek vengeance for the death of his father, and the tenets of his clan reinforced it. However, the vows of the Anla'shok probably took precedence over the strictures of a warrior's clan. He hoped they did.
Try as he might, Vance could find nothing in the history or traditions of the Anla'shok forbidding Merreck from fulfilling the vow he owed to his father and clan. Even though he had gone through the same ritual of burning his possessions as Vance had, there was no reason for him to forget past sins. Even worse, the Star Riders considered themselves clan members for life. Even if they joined other clans or cultures, they would be returned to the Star Riders for burial. Merreck would be a member of the Star Rider clan even after his death as Anla'shok.
The Minbari were also very dogmatic about their memories and how they regarded past slights. They were generally quick to forgive, but they never forgot. Where Merreck was concerned, he seemed to have decided to skip the "forgive"