There's the slightest pause, and then he starts with a: "Well."

It's a little bit of an awkward 'well.' Billy sure sounds like he's far out of his comfort zone here, hearing the sort of stuff John is saying. It shouldn't be a surprise with the way the other looks, and yet..

"It certainly sounds like you are far more acquainted with the concept than I am." That's for sure, considering Billy never even considered the possibility of multiple worlds before ending up here and being confronted with it! "It should help you settle in here. Most of us here were not familiar-- It means having to do more adjusting, especially at first. But you could just see this as.. a strange new world you had not seen yet, I suppose."