Leonel's booming words traveled far and wide, so much so that many Factions outside of the Sword Faction heard his call. In fact, even the Spear Faction which he had just left heard him.
Challenges between Factions wasn't unheard of, but doing it like this most definitely was. Even when the Sword Faction had gone to antagonize the Spear Faction, they didn't do it so openly and boldly. While they had appeared outside of the Spear Faction, they didn't levy a formal challenge, all they did was wait and the sparks of battle happened naturally.
Of course, doing even that was highly arrogant and it caused the fury of the Spear Faction. But back then, the Sword Faction had gained the upper hand especially with the fall of the Stalwart Polearm Party. The gap wasn't enormous, but between such strong existences, just small differences were able to tip the balance.