en_tn/lev/09/09.md

sons of Aaron presented the blood to him

This implies that they caught the blood in a bowl as the blood drained from the animal. The full meaning of this statement can be made explicit. (See: rc://en/ta/man/translate/figs-explicit)

horns of the altar

This refers to the corners of the altar. They are shaped like the horns of an ox. See how you translated this in Leviticus 4:7.

at the base of the altar

"at the bottom of the altar"