What is one weakness of repeating “al-qatl” in the maxim?

Musāwāt and Ījāz al-Qaṣr: Proportionate Wording and the Rhetoric of Qiṣāṣ

• The two words must be feminine sound plurals
• Both instances must have the same case ending
• The distinction between lawful retribution and unlawful killing may need extra context
• The repetition always creates a conditional clause