What is the grammatical status and nominative marker of ʿaynāki?

Imruʾ al-Qays: Address to Fāṭimah, Parting, and the Arrows of the Eyes (Verses 19–22)

• Sound-plural object marked by yāʾ
• Dual subject, nominative marked by alif
• An indeclinable conditional noun
• An accusative predicate of inna