Drinking the blood from the heart of an elk/deer fresh killed is what a hunter should do??? I have never. Some i've hunted with, do.
Mixing the blood from a just killed critter with the hunter's blood; is that the right way??? I have done this many times, but never on purpose. It seemed i did the right thing whenever my blood mixed with elk blood, but i never tried on purpose. It seems right to share blood with the critter from which you took life, and to give thanks for the meat.
Myself, i don't know the answer, but it may be that a willingness to kill, should include a willingness to die.