[That's an understatement, but the important question is what exactly is going on. There are only a few possibilities, all of them fantastical, but he silently examines each one in turn, uncomfortably aware of the adage, "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth."

Not all of the things he considers are impossible, but in the end, one is simply more probable than the rest.

If one considers any of this probable. But Godric is adapting.

With some hesitation, he speaks his mind.]

I would believe it highly improbable under other circumstances, but considering where we have found ourselves and the incredible variety of worlds the Porter seems to have access to, it stands to reason that perhaps we are not from the same world after all. Very similar ones, surely, but different enough.