Kyon found two ways to leave the cell.
The first one is to transform into Dick, create a clone outside the lattice and immediately move to it. But then he will have to explain how he appeared in the dungeon without being recorded, and even right at the time of the criminal's disappearance…
The second one is to teleport to a trigram at the headquarters or outside the city. Yes, he had thought out the escape routes in case of danger in advance.
There is just one catch: the barriers that jam the signal (spatial attribute) also block movement through teleportation trigrams. Such a barrier is imposed on both the Silent Horror clan and the dungeon. It is made in order to prevent criminals with connections from sending the signal out through a formation or a sound transmitter, because if the frequency of the device is not registered in the database, then it will not leave the zone of the barrier.