There's an interesting leopard hunting video clip on the Hunting Report website. You can see it at the link below:

http://www.huntingreport.com/video_hunt_list_species_re....cfm?species=Leopard

There's a female feeding in broad daylight followed by the approach of a huge male in the rapidly fading light. The captions say "20 minutes after dark", etc. He meant after sunset and they were approximate times. The leopard was taken with natural light at the last minute.
It's good footage because you get a sense of the anticipation and anxiety about whether he'll show in time for the shot. He does, but too late for the camera.
The post recovery footage shows what a monster he was. The PH and hunter worked him for several days to get him in before total darkness. It was a good hunt.

Enjoy.