(Mishnah): He slaughtered it and received the blood in a bucket. He gave it to someone who stirred it on the fourth stratum in the Heichal, lest it congeal.

He took the Machtah (incense pan) and ascended to the top of the Mizbe'ach. He cleared away coals in this direction and that direction, and scooped from inner consumed coals. He descended and left it on the fourth stratum in the Azarah.

(Gemara): Our Mishnah should say [also in the Reisha] "on the fourth stratum in the Azarah.'' (Someone stirs it, and no one may be in the Heichal when the Kohen Gadol goes inside.)

(Beraisa): If he slaughtered [the bull] outside he is liable. If he took a double handful [of Ketores] outside he is exempt. If he scooped [coals] and burned [Ketores] and the blood spilled, he brings another bull and enters with its blood. (He need not burn Ketores again.)

If before he burned, the blood spilled, the scooping is Pasul. He needs to scoop from the beginning.

If it is a Safek whether before Haktarah the blood spilled, or after Haktarah the blood spilled, you cannot bring another bull and enter its blood [without another Haktarah], for I can say that the blood spilled before Haktarah, and the scooping is Pasul, and he must scoop [and burn] from the beginning;

And he cannot scoop [and burn] from the beginning, for I can say that the blood spilled after Haktarah, and the scooping [and Haktarah] was Kosher, and he transgresses entering [the Kodesh ha'Kodoshim] more than needed!

Question: Are the Avodos Batel - will you say that the Avodos of the day are Batel (he cannot continue Avodas Yom Kipur?! Rather, surely this is not so! Rather, he enters to burn again - OHR SOMAYACH Avodas Yom ha'Kipurim 5:25.)