I suppose we're finally starting to see where some of the ship's ghosts have gone.

[ The detail in Skulduggery's notes about them maybe being previous passengers really, really stayed with Arthur. And it makes the ghosts' situation horrifying, yes, and yes it makes them default to sympathetic; but that sympathy is incredibly quickly lost when they start attacking people.

Arthur says this, and amazingly manages to only sound highly nervous, and not like someone who has really specific getting-possessed-related trauma ha ha ha no he's fine he's super fine. ]

What did you think had happened to him? Just... lost his mind? [ He's taking from Steve's answer that possession was not on the table until just now. Which, fair, the sane reaction would probably be to not leap straight to that. ]