The Messenger of Allah ﷺ rode a horse and fell down from it and his right side was grazed, and the rest of the hadith is the same, and (these words) are found in it:" When he (the Imam) says prayer in an erect posture, you should also say it in an erect posture."
أَنَّ رَسُولَ اللَّهِ ﷺ رَكِبَ فَرَسًا فَصُرِعَ عَنْهُ فَجُحِشَ شِقُّهُ الأَيْمَنُ بِنَحْوِ حَدِيثِهِمْ وَفِيهِ إِذَا صَلَّى قَائِمًا فَصَلُّوا قِيَامًا