We all know that everything in nature gets along and frolics together. Must have been some evil human hunters that staged this and photo shopped the video !!!
Probably a bad shot from an "assault rifle" the split the belly open....
Have lived my life around livestock and have seen wounds that would absolutely be agonizing for a human but the animal was calmly eating hay. It's easy to try and put human feelings to animals but their pain receptors and nerves have to be a lot different than ours by their reaction to trauma.