It is good that you noticed a glimpse of the bookcase and torch as I did it this way on purpose. You can return and lit the torch later and get some valuable info from the book. You will also see the other torch and the bookcase a bit later. Thank you for playing!
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Oh, I see. I was trying to get to it for a while, because I forgot about the other lever, so I thought this was the only way to go forward.
Once I did go back...I reached a point where I had to set it aside (and there may have been an actual bug, where I pushed the burner up against the angled wood, and it seemed to get stuck there and I had no way out; I just stood on the burner until I ran out of health and could reset). There's a lot I like in here, with the opening of passages and new jumping platforms and so forth. It's also just a little daunting at the moment.