أَوْ نَكِرَةً غَيْرَ مُعَيَّنَةٍ، نَحْوَ قَوْلِ الْأَعْمَى: «يَا رَجُلًا! خُذْ بِيَدِي».
Translation: Or the addressee may be an unspecified common noun, as when a blind person says: “Some man, take my hand!”.
A non-intended indefinite does not identify a particular addressee, so “rajulan” is accusative, unlike the intended “yā rajulu”.
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Al-Munādā: Vocative Types and Rules
أَوْ نَكِرَةً غَيْرَ مُعَيَّنَةٍ، نَحْوَ قَوْلِ الْأَعْمَى: «يَا رَجُلًا! خُذْ بِيَدِي».
Translation: Or the addressee may be an unspecified common noun, as when a blind person says: “Some man, take my hand!”.
A non-intended indefinite does not identify a particular addressee, so “rajulan” is accusative, unlike the intended “yā rajulu”.