قَامَ الرَّجُلَانِ كِلَاهُمَا — Both men stood.
قَامَ: past verb.
الرَّجُلَانِ: nominative dual subject by alif.
كِلَاهُمَا: nominative dual-type semantic emphasis by alif; kilā is mudāf and humā mudāf ilayh.
Both subject and emphasis are nominative.
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Tawkīd: Verbal and Semantic Emphasis
قَامَ الرَّجُلَانِ كِلَاهُمَا — Both men stood.
قَامَ: past verb.
الرَّجُلَانِ: nominative dual subject by alif.
كِلَاهُمَا: nominative dual-type semantic emphasis by alif; kilā is mudāf and humā mudāf ilayh.
Both subject and emphasis are nominative.