I will confirm once I get my hands on it to fully test it, but I believe that content revealed by the torchlight would remain visible, but that the player that gets left behind may find themselves sitting in the dark with the torch light visible up ahead. Our token locking and movement allows for movement through darkened areas and you stop automatically when you hit an obstacle that you didn't otherwise see. The tool also allows the GM to modify the amount of falloff for light sources so it doesn't have to be a sharp drop from light to dark.