What is a high priority assignment in an emergency department when a nurse is providing care for clients during a mass casualty?

When there is a situation of mass casualty and nurse is providing care for clients. A high priority assignment in emergency department is the client who is unconscious and has a lot of bleeding from the chest and the client is unlikely to survive because of that massive bleeding. That client was black tagged and given the highest priority.

Very hard to understand

It forms into a full nebula/star