Mr. Zheng Zhijun's words seemed simple, but to the Patriarchs of both families, they definitely carried a warning. Moreover, the presence of nearly a platoon of people sent a clear message. Even if these soldiers were only ordinary soldiers and not particularly strong, and the Family Guards could easily handle them, what they represented was the nation. No matter how inflated their families' egos might be, they dared not oppose the state.
On another level, it seemed that the higher authorities were already quite displeased with the families' flagrant pursuit of vengeance. Thus, they had sent someone to supervise, and if they did not handle the situation well, they really might face suppression from above.
However, things had already escalated to this point, and the arrow was already on the string; they had to shoot. If they were to cease hostilities now and allow Song Xiaodong to leave, the families would lose all face completely.