Leopard is dangerous game hunting. I've never hunted leopard, but it looks to me like they did what they were supposed to do.
The cat was wounded at night. They elected to not follow up at night - which seems prudent. Why go in at night after a freshly wounded leopard? Yes, it would have been better had the cat died right there, when shot the first time - that doesn't always happen in hunting and this isn't a whitetail deer we're seeing. Letting it lay up overnight, they just might get lucky and find a dead leopard in the morning.
So, the next day, they get their guns and go in as a team. They know it's likely the leopard will charge if it can. It does, and they shoot it, or shoot at it, several times, eventually killing it. One guy is mauled, but not bad compared to some leopard attacks.
What's the problem?
It's called dangerous game hunting for a reason. Time to time the dangerous game wins. Buffalo, elephant, lion, leopard, rhino, even hippo in the right circumstances... At least according to the reading I've done and the hunters with whom I've talked.
I've hunted cougar and bear - which at least have the potential of being dangerous - and I'd love to hunt leopard. Mostly because it's got a chance to turn the tables. This is no whitetail, it's a fast, mean, effective predator known to go after men, provoked or not. Wounded or not. I for one am glad there are still opportunities to hunt dangerous game, and men still willing to do so.
Regards, Guy