"Well, many people here have made the Nexus itself their home. Either that or they've resettled into a different world then the one they originated from. Both options are not uncommon exactly, though there are some paradoxes to consider, obviously. If another you existed in that world, for example."

Katsuya doesn't quite seem to be able to read the atmosphere between these two. He's as obliviously helpful as he is informative.