I saw that same film you are talking about, it was on TV a few years back. If I remember correctly, it was a complete setup.
It was filmed by an animal rights group (PETA or USHS) surrepticiously, using "undercover hunters" (animal-rights agents provocateurs) who found some guy running a sleazy exotic game hunting operation in Texas and engineered what they knew would be a very controversial "hunt".
It was really pretty sickening, wasn't it? I mean, I've hunted for boar on game preserves, but I've never seen anything as disgusting as that film.
Even more disturbing is the fact that that leopard was killed so that the "animal rights" people could make the film. It was sacrificed in the name of publicity for PETA.