When enemies begin to detect you. an Awareness Meter is displayed overhead, gradually filling up. A full white meter means an enemy will search for you. A full red meter means you have been detected
Dishonored 2: Awareness
From Orcz
When enemies begin to detect you. an Awareness Meter is displayed overhead, gradually filling up. A full white meter means an enemy will search for you. A full red meter means you have been detected