en_tn_condensed/psa/068/022.md

I will bring them back

The word "them" refers to God's enemies.

so that you may crush your enemies, dipping your foot in blood,

This describe the battle where their enemies are completely defeated. In a great battle like this, there is a lot of blood. Here it speaks of them stepping in that blood. AT: "so that you will totally defeat your enemies, stepping in their blood,"