I asked Thabit al-Bunani whether it was permissible for a man to talk after the qamah had been pronounced. He narrated a tradition on the authority of Anas: (once) the Iqamah was pronounced, and a person came to the apostle of Allah ﷺ and detained him after the Iqamah had been pronounced.  

عَنِ الرَّجُلِ يَتَكَلَّمُ بَعْدَ مَا تُقَامُ الصَّلاَةُ فَحَدَّثَنِي عَنْ أَنَسِ بْنِ مَالِكٍ قَالَ أُقِيمَتِ الصَّلاَةُ فَعَرَضَ لِرَسُولِ اللَّهِ ﷺ رَجُلٌ فَحَبَسَهُ بَعْدَ مَا أُقِيمَتِ الصَّلاَةُ  

[Machine] The prayer was performed, and a man presented himself to the Prophet ﷺ, so he detained him after the prayer until some of the people fell asleep.  

أُقِيمَتِ الصَّلَاةُ وَعَرَضَ رَجُلٌ لِلنَّبِيِّ ﷺ فَحَبَسَهُ بَعْدَمَا أُقِيمَتِ الصَّلَاةُ حَتَّى نَعَسَ بَعْضُ الْقَوْمِ