Danger is the first step of the primary survey and the one most people treat as a single check at the door. It isn't. It's continuous. Conditions change — a crowd builds, a vehicle moves, someone who was calm isn't any more, weather turns, a second casualty appears. The scene you assessed ninety seconds ago is not the scene you're standing in now. Four priorities, on repeat: identify hazards · reduce risks · protect yourself with PPE · decide whether it's still safe to be there. And the uncomfortable one — if it isn't safe, you don't go in. Waiting for police or fire isn't hesitation. You cannot help anyone if you become the second casualty.