What does the man with shaded eyes mean when he says he knew it was a power of darkness that was haunting the room?

The man with shaded eyes is expressing his awareness of an oppressive, malevolent force in the environment, suggesting that there is a sinister influence at play. This power of darkness symbolizes fear, evil, or despair, indicating that something troubling or ominous is affecting the atmosphere. His insight reflects a deeper understanding of the emotional or psychological turmoil present in the room, implying that it's not just a physical presence but an intangible, harmful energy.