It looks staged. It looks like he put the snake on the tortoise with a snake hook. I should know. I stage photos all the time, except mine don't make the media because I'll admit to staging them. Nonetheless, it's a great video/photo.
Maybe, but I do know it's fairly common that rattlers share the same dens with others such as tortoises and Gila Monsters. I also heard that the photographer went to photograph the tortoise and didn't know the rattlesnake was there until it climbed on.