This is a symbolic action that identifies the person with the animal he is offering. In this way the person is offering himself to Yahweh through the animal. (See: [[rc://en/ta/man/jit/translate-symaction]])
It is implied that before they sprinkle the blood, they catch the blood in a bowl as it drains from the animal. (See: [[rc://en/ta/man/jit/figs-explicit]])