The Chiefs Have Been Imprisoned

After moving further and approaching the final cell door, Mo Fan, Lingling, and Ozawa heard a voice that sounded like a foghorn.

Mo Fan and Lingling panicked.

They had arrived at the final cell door. Even if their presence were discovered by others after entering through the cell door, they would have, at the very least, assessed the situation inside and figured out what happened to the East Guardian Towers, 

But if they were stopped here, they could not do anything.

"Officer Ozawa, you seemed to have forgotten the rules. Those who enter the East Guardian Towers have to report to the Chief beforehand, especially if it is a new person." The leader of the Guard Regiment raised his hand to remind the guard at the final cell door to keep watch.

Mo Fan made the decision to storm the towers after noticing that things did not appear to be going well.