Six in the fifth place means

Darkening of the light as with Prince Chi.

Perseverance furthers.

Prince Chi lived at the court of the evil tyrant Chou Hsin, who, although not mentioned by name, furnished the historical example on which this whole situation is based. Prince Chi was a relative of the tyrant and could not withdraw from the court; therefore he concealed his true sentiments and feigned insanity. Although he was held a slave, he did not allow external misery to deflect him from his convictions.

This provides a teaching for those who cannot leave their posts in times of darkness. In order to escape danger, they need invincible perseverance of spirit and redoubled caution in their dealings with the world.