What occurs between the men at the party? What does this foreshadow?

Two men at the party begin to fight. One is a Pashtun and the other is a Tajik, and they enter a political discussion which gets heated. Tariq joins in their fight. Tariq is not seriously hurt. Bombs fall in Kabul, and Massoud's patrols are everywhere. Tariq starts to carry a gun for safety, and in June of 1992 the Pashtuns and Hazaras fight in Kabul. Soon after, the leadership of Afghanistan begins to crumble, and the Mujihadeen begin to fight amongst themselves. Fariba mourns again.