Lucian: The berk is saying something...known (or at least suspcted) pit trap ahead of you (just past the two open pits)...theivery skill...yep, he is saying something.
Nar-Heru: (those rolls...) You use some components. The magic seems weaker here. That fresco does seem a little suspicious, but for all you can tell, its just a painting. As for your history, again, not helping too much. Must have learned the wrong things. Though its also possible they are just not relevant.
Edit: just to be clear, you have a 20 foot wide hall that goes outside your light. On the right side after 15 feet are two open pits, creating a 10 by 20 foot long hole with a thin wall of stone in between them. To the left, you can advance paralel to the pits, but then Forge suspects a pit lies just beyond that, again on the left side. He doesn't suspect another unseen pit on the right side beyond the two.
Also: Forge tossed a big stick onto the suspected pit on the left side. That didn't triger it.