What does fronted “lakum” highlight in the qiṣāṣ verse?

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

• Only the agent’s identity
• A change of verbal tense
• The indefiniteness of “qiṣāṣ”
• Benefit and welfare for the addressed community