Haal (حَال) is a mansub expression that describes the condition of the subject, the object, or both when the action occurs.
Ask 3 questions:
1. What action occurred?
2. Whose condition is being described?
3. What was that condition at that moment?
The person or thing whose condition is described is called ذُو الْحَالِ or صَاحِبُ الْحَالِ.