[The secret is that beneath the surface Jean has a temper that he's been working to tame since he was very little; his first meeting with his best friend and business partner when they were children (and he was nearly orphaned), he had beaten Locke wildly due to a careless comment about his parents. Though he learned not to display his rage publicly, it still simmered below--and being summoned to another world and locked in a cell only fueled the rage.]

Do you think you've done anything to deserve your cunt being gilded, you piece of--

[And that's when the guards arrive. Two of them. One wrenches the poor victim of this charade back from the cell door and takes her back upstairs, likely tutting about this being an example of why these people were harmful to Thorne. The second actually unlocks the door and enters to punish Jean for his outburst.]