[Okay. This is sort of creepy but also intriguing. Jamie glances around again, as though he just wasn't looking hard enough the last time, and turns away from the observation window to face his invisible companion.]

How come nobody can see you? Are you, like, a ghost or something?

[Does this mean ghosts have dreams? Can ghosts swim? Has the ghost been wandering around watching everyone change out of their wetsuits and stuff? This raises so many questions.]