Offering the funeral prayer while standing

It was narrated that Samurah said:

"I offered the funeral prayer with the Messenger of Allah for Umm kab who had died in childbirth, and the Messenger of Allah stood in line at her mid-section to pray."

أَخْبَرَنَا حُمَيْدُ بْنُ مَسْعَدَةَ، عَنْ عَبْدِ الْوَارِثِ، قَالَ حَدَّثَنَا حُسَيْنٌ، عَنِ ابْنِ بُرَيْدَةَ، عَنْ سَمُرَةَ، قَالَ صَلَّيْتُ مَعَ رَسُولِ اللَّهِ ﷺ عَلَى أُمِّ كَعْبٍ مَاتَتْ فِي نِفَاسِهَا فَقَامَ رَسُولُ اللَّهِ ﷺ فِي الصَّلاَةِ فِي وَسَطِهَا .