[Okay he hadn't actually thought Bill would agree. He must really want this.]

Well, I was thinking, something like:

Attention residents of the Barge. It has come to my attention that the reason for the recent rash of gravitational and spacial anomalies is an attempt on the part of my inmate, Bill, to improve his situation. While I do not approve of the way in which he went about this, it's done now and it was done with safeguards in place to reduce the risk to all of us.

While I am dealing with this issue, you should know that you may begin to see things created by your own mind. Please keep in mind that they cannot harm you, and take precautions.

I'm sorry for the inconvenience this is causing, and I assure you I am going to take every available action to fix this.