لِيَبْكِ يَزِيدَ ... ضَارِعٌ لِخُصُومَةٍ
Let Yazīd be mourned … by a needy man overwhelmed by a dispute.
Hearing «لِيَبْكِ يَزِيدَ» can leave the hearer wondering who is to mourn. «ضَارِعٌ لِخُصُومَةٍ» subsequently identifies the mourner. This produces the effect of detail after initial suspense: attention is first aroused and then satisfied.
Bringing Yazīd forward also makes him prominent. The mourner's needy condition evokes Yazīd's significance for those who depended on assistance.
The analysis rests on assigning agent and object correctly in the chosen syntactic reading. Word order matters rhetorically because it determines what the listener encounters first and what is explained afterward.