I'm pretty sure they didn't disappear on purpose...they were busy trying to build a train track to Dranbu. So it'd be easier for people like you to see the other cities.

[He's trying to appeal to the broad and understandable here, things that would make sense to anyone regardless of position rather than things she'd only understand if she had her memories. He doesn't know her well enough for it to be a distraction, at least, because he'd probably be doing a much worse job of it with someone he'd met more than twice before.]

I think it's kind of hard to believe you don't like people that much, though...