A thought occurs. Mermaids eating fish isn't cannibalism, in the same way that humans eating monkeys is not cannibalism. Since Faunus have animal-LIKE features but are not TRULY animals, wouldn't that NOT be cannibalism? Food for thought.
I was wondering about that because one of the songs from the game is called 'Rules of Nature' and one of the bosses constantly talks about how "The strong prey upon the weak". I'm probably reading WAY to much into this, but even if it wasn't intentional it's pretty cool nonetheless.