en_tn/rev/16/06.md

they poured out the blood of God's holy people and prophets

Here "poured out the blood" means killed. Alternate translation: "they murdered God's holy people and the prophets" (See: rc://en/ta/man/jit/figs-metonymy)

you have given them blood to drink

God will make the evil people drink the waters that he turned to blood.