And What is it adding in the current two Pesukim?
Rashi and Ramban (on Pasuk 2): It is adding a La'av against burning the limbs of the Korban to that of Shechting it, on a Bamah outside the Azarah. 1
Why does the Torah write "Ish Ish" here?
Torah Temimah (citing Zevachim): To teach us that, if two people burn the limbs of the Korban on a Bamah, they are both Chayav.
Targum Yonasan: Refer to 17:3:1:2*.