This genuinely interests him. Of all the things that could result from interdimensional travel, duplicates are not anything he'd even vaguely considered, seeing as how he predates Hugh Everett by a few hundred years. Still, the idea of two of the same being needles at what he knows of early physics. He can't quite put his finger on why it shouldn't happen, but it just... doesn't seem as though it should.

"I've the suspicion that usually that would result in some kind of disastrous reaction of energies that we've only just begun to understand," he muses.