I don't see the part where he was cruel to the animal. The animal has no idea how far the shot was. The animal died seemingly as quickly as it could die and I doubt the animal heard his comments and even so I don't think animal spoke and understood english....
It was not cruel to the animal.
It just seemed to me that he should have had more respect than laughing like a drunken hyena.
It seemed like he was gloating at how much better he was than the animal.
Back on topic though - that was one hell of a shot. I'd love to see what the actual shooter saw in his scope and how big the animal was compared to the reticle.