tahajjud

Sitting and performing the two rakaats nafil after witr Salaah

Q: I usually pray two rakaats sitting after witr since this was the practise of the Prophet (Sallallahu Alyhi Wasallam). However, I now came across a Hadith saying that the Prophet (Sallallahu Alayhi Wasallam) didn't do these rakats 100% sitting, rather he stood up before ruku and made the ruku from a standing position. Can you please advice how to perform the two rakats. The hadith is: “He observed thirteen rak'ahs (in the night prayer). He observed eight rak'ahs and would then observe Witr and then observe two rak'ahs sitting, and when he wanted to bow he stood up and then bowed down, and then observed two rak'ahs in between the Adhaan and lqama of the dawn prayer.” (Sahih Muslim)