What can the indefiniteness of “ḥayātun” suggest in this context?

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

• Absolute negation of life
• Magnification of the far-reaching benefit of life
• Exclusively one identified person’s life
• That qiṣāṣ has been abrogated