Both nightmare and Razia were having a heated argument , as nightmare kept pestering Razia to do something and save them , alas Razia too, was not currently in his full tier 5 glory , he was stuck inside this tier 2 body where he could only show a fraction of his true power.
Also the man leisurely strolling infront of him , gave him chills , he was intimidated by a weakling , and as a proud dragon , he would never admit to it.
Only when nightmare finally calmed himself , regaining his poker face , that someone may know about the lost kingdom of draconia , as it is mentioned in lore here and there that Shakuni must be grasping at straws here , only by seeing his massive blood dragon move is he bluffing, about knowing his secrets , he was trying to reason with himself when Shakuni dropped another psychological attack , that completely destroyed his psychè .