Actually, the Gilded Kingdom needed that negotiation more than the forces in the Breezy Plains. That was also the reason they put on a domineering front as soon as they appeared, vehemently refusing to give any concessions, because they knew that once they let up, there would be a chance that their opponents would realize the situation that they were in. By then, those forces would definitely be even more aggressive.
However, what Cantory and the rest did not expect was that the young president of the Tower of Dusk did not care about the so-called forceful deterrence of the Gilded Kingdom. He was either confident that he could deal with the Gilded Kingdom, or had already seen through the facade of the Gilded Kingdom's envoys, and knew that they were only pretending to be intimidating. However, regardless of the reason, they'd already caused Cantory and the others to fall into a dilemma.