What does Felix tell the ministers—and the other inmates and officials in the prison—in order to camouflage his play within a play?

Felix has planned to broadcast the videotaped performance of the Tempest to the prison population on closed circuit television, but he has reserved the ministers for a private experience which is more of an “interactive piece of theatre, experimental in nature” (212). He tells the other prison guards and prisoners that if they hear “strange noises,” they should not be alarmed, as they are “all part of the play” (212).