Time was of the essence.
Although the forces of Prince Yun's Mansion, the Li family, and Cloud Smoke Pavilion had all withdrawn from the Lingyun Royal Capital, they hadn't lost too many of their experts, and still possessed enough strength to pose a threat.
Moreover, the Dragon Clan's power had been entrenched here for years, and who knew how many people carried the bloodline of the dragons. Even if their strength was lacking, they could still act as internal agents. There were also rogue cultivators at the Shattering Stage, and no one knew if they would become part of the Dragon Clan's forces at any moment.
Thus, the Lingyun Royal Capital was not safe.