question #1 Sahih al-Bukhari 148, Book 4, Hadith 14 : What is the significance of the direction faced during answering the call of nature in Islamic teachings?

I went up to the roof of Hafsa’s house for some job and I saw Allah’s Messenger (ﷺ) answering the call of
nature facing Sham (Syria, Jordan, Palestine and Lebanon regarded as one country) with his back
towards the Qibla. (See Hadith No. 147).