Approach the large telescope on the balcony. Insert the three plates into the side console.

Your flashlight is essential but limited. Use it sparingly. Batteries are scarce.

The boss moves faster than you in an open hallway. Break line of sight by turning into rooms.

Once I have a better understanding of the context, I'll do my best to provide a detailed and helpful walkthrough.

Walk to align your character with the mirrored clone.