You follow the shadow, taking care not to run down your energy.
Preserving energy is sometimes the best thing to do. Good 'un, thinso!
The shadow stops moving near a small door. The light casts a shadow on the wall of the thing. It has a flat head (or no head at all!!!) and seems to be unusually shaped. It looks like it is.... scary and evil! Whatever it is appears to not like being in sewage water very much. You sneak slowly and watch it from afar. You're getting bored of doing normal boring things.