They can catch a glimpse of sparkling, green scales in the darkness, but they won't run into the danger, unless they decide to seek it out. It's just something they can be aware of.

At the exit they will find another puzzle as a lock in a door (going up into the ceiling, or down from their point of view). A Sliding Puzzle. The goal is to get all the numbers in order. Once again they have three tries before they fail the puzzle (there's a button that resets the whole puzzle if they get too stuck).

Behind the door they can feel a sinister feeling. Like something very dangerous lies behind it. The feeling they get in this room is nothing compared.