question #2 Sahih al-Bukhari 690, Book 10, Hadith 84 : How does this narration illustrate the discipline and unity among the companions during prayer?

(and he was not a liar) When Allah’s Messenger (ﷺ) said, “Sami`a l-lahu liman hamidah” none of us bent his
back (for prostration) till the Prophet (ﷺ) prostrated and then we would prostrate after him.