Reference:RAWA/Prisoner in Riven
This was posted to the Riven Lyst, though the date of the posting is unknown. If you know when it was posted, please move it to the appropriate Lyst posts article.
NOTE: This statement helps explain just why that Rivenese "prisoner" was sitting in the cell, and not escaping through the hidden passage.
Q: Why was the prisoner sitting in the prison in the first place? Why didn't he just disappear as soon as he was locked up?
A: The "prisoner" is a rebel maintenance man, working on the door. He hears you operating the gallows machinery, and pretends to be asleep, then sneaks through the passage while you're watching the cell open.