classDiagram
    class Entity {
        <<Subject & Observer>>
        -List~Entity~ _observers
        +Entity Prey
        +Attach(observer: Entity)
        +Detach(observer: Entity)
        +Notify()
        +Update(subject: Entity)
        +Move()
    }
    
    class Morg {
    }
    
    Entity <|-- Morg
    
    note for Entity "Entity can be both Subject (prey)
and Observer (predator)

- When prey moves, it Notifies observers
- Observers Update() to follow prey
- Enables predator-prey following behavior"
    
    Entity --> Entity : observes
    Entity --> Entity : subject
    
    note for Entity "Observer Flow:
1. Predator finds prey
2. Predator.Attach(prey)
3. Prey moves
4. Prey.Notify()
5. Predator.Update(prey)
6. Predator turns toward prey"