I hear you, Jabes. Check
the picture that gives more detail than the map representation.
The light source in the corner is not a torch. It’s a structural stone fire place built into the wall. It does create some shadows around the structure below and around it, also might give some slight cover if you crouch down off to the side of it, and alternatively has a higher perch to jump up onto if one needed to move quickly to some higher ground for sighting, evasion, whatever. For those reasons, I thought of it as having some potential as something better than nothing on terrain optimization.
But as far as lighting goes, you guys are pretty well covered in fire-based light. This room isn't going to be the light and visibility challenge as the Chessboard Battle Scene was.There are 2 big cauldrons on the main floor, plus the fireplace sitting high. Kray just threw down another torch. It’s a pretty small place too – not much floor to choose from. Nice shadowy nook hiding places to completely withdraw into are going to be in short supply unfortunately.
Best hiding efforts would be to withdraw out of the room and back up the ramp of the ascending (from this position) tunnel. With the upward slant there, it isn’t long before visibility is cut off by the line of sight angle through the threshold.
Your call – name a place and Iasu has position there.