By the time Chun Hai arrived at the Long army camp, he was promptly informed by Prince Houyi's spy that Prince Rui had been moved to Jingli city. And so Chun Hai had no choice but to change his plans and follow him there.
While his chances of escape were better in a city as opposed to an enemy army camp, the problem was that he would be left to figure out how to infiltrate the residence Prince Rui was be staying at on his own.
The spies Prince Houyi had in the army could not help him there because they had no ties to anyone in the unit that was guarding Prince Rui as they part of the Emperor's personal army. They even refused to attempt to help out of fear of exposure.
As for the escorts, Prince Houyi had sent along with him, the men told Chun Hai that they were only meant to bring him to the camp and were not authorized to enter Long country itself. So they wished him good luck and then left with haste.
