It's telling Eva freezes a bit before answering, voice light even if she doesn't feel it. For all she trusts Kaiba- It's fast becoming a habit to brush over her world, to tell people just enough but never go into detail.

And well. She's pretty sure people would have a heart attack at the thought of an AI, no matter how chained and shackled and bound to her will it is, on the train. Or think Lele was sentient, or worse, sapient.

"Huh? Oh, just that this reminds me of Kaina's markets, but underwater."