This is the "Weeping Angel" mechanic. When your camera is on his location, he freezes. When you flip up the camera or look at a different room, he takes one step.

), an adult-oriented indie visual novel and puzzle game developed by the group Shiritsu Sakuranbo Nyuugakko Overview of The Nightmaretaker

To your right is a portrait of a woman. As you approach, her eyes will follow you. This is a sanity drain zone. You have 15 seconds to grab the from the table beneath her. Do not look at her eyes for more than 2 consecutive seconds. Look at her dress, then the key, then the door.