Hominids have been bleeding their kills since at least H. heidelbergensis, that's 700,000 years.
Why do these guys who are chalcolithic at the earliest, not know how to do it?
Worse yet? They just eat the hind legs and throw away tons of meat. These giba are hog-like creatures. There's gotta be at least 50 pounds of meat on most of them given the size we see. And they just eat the fucking hind legs and throw away the rest.
Meanwhile, trying to utilize every part of the animal because you don't know 1.) If you'll be able to find another animal and hunt it and 2.) Because utilizing the entire animal means you have to hunt less is just... common fucking sense. Literal fucking cavemen were doing this.
I mean, all it would take is for one forest person that isn't a brain-dead moron going, "Y'know, all we eat are the hind legs on these things. If we ate all of the meat we could get by on hunting less, which is good since hunting them is dangerous." Then again, given this culture, they probably immediately stoned him to death for heresy or something.
(Also, I said it before but I'll say it again. I get a kick out of their batshit insane reasoning. Their custom, to the point of basically being a law, is that "we may eat only giba and what the giba eats." Okay. Going by that logic, what happens if a giba kills a human? Giba is going to eat it. By that logic, cannibalism is a-okay. Since, y'know, the giba eat humans.)