What are the sayings of scholars regarding the Hadith of Ummuna Sawda: "I held my nose until it almost bled during prayer"?

Ibn Sa'd narrated that Sawdah said to the Messenger of Allah, peace and blessings be upon him: "I prayed behind you last night, and you prolonged the bowing until I held my nose for fear of it bleeding," and he laughed. Ibn Hajar explained this narration as Mursal, and its narrators are those of the Sahih. Her statement indicates the prolongation of the bowing, and that she was light-hearted, making the Prophet, peace and blessings be upon him, laugh with her pleasantness.