I am on the leopard's side here. Leopards, and most members of the Felidae (cat) family, are sentient, and we hunted some members of this family to near extinction because of accounts like these. Accounts that glorified the "adventure" of going into their habitats, killing their prey, and then shooting them with gun powder and a metal slug.
This man wasn't a scientist. He was a thrill seeker. One who killed sentient beings for amusement and then donated the carcasses to a museum.
If he was a scientist, quietly observing the fauna, and taking notes, I would have had no objections to him killing the leopard in self defense. Instead, he encroached on a sentient being's habitat + territory with hostile intentions. And was attacked for it. I do not wish him harm, but I feel more for the leopard than I do for him.
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If you doubt that these are animals capable of joy, I'd suggest watching this, https://www.youtube.com/watch?v=NWuFoPguAlE
Of course, they're still wild animals and you should stay away, but they are sentient and should be treated with care.