Horrendous indeed is this picture of a human zombie , under the influence of a powerful drug, LSD, chewing the face of another human being! My take is that, not only was he under the influence of a powerful drug, but that this drug had allowed into this zombie's mind, evil, vengeful spirits, who had taken possession of him as well.
This powerful drug had opened up seeds of powerful negative karma as well as fuel his karmic instincts/tendencies to murderous violence and beastly, animal-like behaviour.
One of the long term consequences of taking meat is that ,over lifetimes, it will breed a love and craving for raw flesh of any kind, even human flesh.This is what is stated in Shabkar's "Food of Bodhisattvas" , and it actually comes from the 'Lankavatara-sutra' !