Difficulty: Any
Location: Pittsburgh - Escape the City
You'll eventually be introduced to Henry and Sam and progress through the story during the night. Henry will make a comment that he'll follow your lead as your approach two hunters around a fire down a long hall. You'll sneak and take one as Henry will take out the other. From here, you'll need to shutoff the spotlight generator which is directly underneath the spotlight itself. Pretty self explanatory. The spotlight is pretty easy to stay out of. There is one guy just walking back and forth in front of the generator. If you're able to keep him busy by tossing a brick you can sneak up and shut it off. The trophy will immediately pop afterwards.
For a video guide, start at 39:12. All credit goes to PowerPyx.