When a complete sentence functions as haal, it needs a link to dhu al-haal. That link may be waw, a pronoun, or both.
Haal expressionSentence typeLinkوَنَحْنُ عُصْبَةٌnominalwawبَعْضُكُمْ لِبَعْضٍ عَدُوٌّnominalpronounوَهُمْ أُلُوفٌnominalwaw + pronounيَبْكُونَverbalpronoun
The link makes clear whose condition the haal sentence describes.