The moment Knox went into the door, he came face to face with a long, dark tunnel. It made him frown, because the door behind him disappeared, which made him unable to return to that bright room from earlier.
Behind him was only another dark path, of which neither side showed the slightest bit of light, but he could see in this darkness just fine.
He chose to walk ahead and look around him. There was nothing suspicious, this was like a normal dark tunnel, without any trace of magic.
It was almost like once he stepped into the room, he was teleported to a different place.
So, he had chosen the wrong room?
Knox kept walking. This darkness, somehow, was comforting and he chose to follow the path.
Finally, after walking for so long, he saw light and soon, a murmuring noise could be heard from ahead. It was bright. Was this already morning? Did he walk that long?