From what I understand; you are stating that only warriors rush to the top of the map to kill the boss while others are at the bottom with the cart killing enemies. You haven't played this event have you? You have to get the cart to the top for the boss to spawn and if you aren't around to help kill it then its your fault. No enemies will spawn very far behind the cart thus making you not be able to help with the boss. You are making random threads with random sentences and are not describing full details.