The Rooms of Antiquities, the pleasant female voice can be heard from the earbuds of the electronic tour guide, contain a number of peculiar objects, many of which are not, in fact, ancient. Several of them were in fact thought to be ancient until they were discovered to be forgeries, or merely more modern pieces confused for older ones.
Well, Theo - being so macho and all - obviously takes no notice of the stuffed toy that might or might not be ruining his macho image.
He says to the girl, somewhat softly, "So. You can see Windy?" He gestures in the direction of the ghost.
"...see what?" she whispers back. The old lady looks at the gesturing boy with puzzlement and annoyance.
A bus arrives. The old lady and the young man board it. The girl doesn't.
"What—who? Is she? Who're you?"
Theo just watches them. It's just typical that this random stranger would get along better with Cerberus than he does.
Cerberus, for his part, isn't terribly flattered. "I'm the Guardian Beast of the Seal! I'm a powerful creature of magic!"
"Okay, this is cute and all, but Cerberus..." Here, he hesitates a bit. "... What about the card?"
"Oh! You have to be careful with it, if you don't undo its changes in twenty-four hours they're permanent!"
"Kero, we need to talk."
He walks away from the bus shelter, expecting the bear to follow.