The point of this RP is to have our characters grow in power. I understand that your character is a very special swordsman, and has age, but the reason our characters grow in power and change over time is because of the Mark. The Marks are just now changing out characters after 10 years of having them, and it's because the Demons are beginning to overtake everything, not just Veiron. I would understand if it was your 10th or 15th post, but for the first 10 posts your character should be going through changes slowly, taking on lower enemies like Orcs, Goblins, other Humans. Know what I mean? It's like leveling up every now and then :P
I would say let the Warrior kill Bile, but have your character take notice of the technique that is used while slaughtering the Demon.