question #1 Sahih al-Bukhari 991, Book 14, Hadith 2 : What is the significance of saying Taslim between the two Rak’ahs and the odd one in Witr prayer?

Nafi` told that `Abdullah bin
`Umar used to say Taslim between (the first) two Rak`at and (the third)
odd one in the Witr prayer, when he wanted to attend to a certain
matter (during that interval between the Rak`at).