ok, its not 100% clear but I would also think its a jaguar, the cat is very well build to much for most leopards. problem is that, imho, there is no legal jaguar hunt anywhere so we see some kind of a semi or illegal hunt here.
there is no doubt that jaguars are shoot by rancher somewhere in brasil, paraguay, bolivia year after year but its hidden deep in the jungle.
excellent reflex by the man with the gun I am sure he had not time enough to shit in his pants