Yes, that is a man, and yes, his head is voluntarily wedged inside the jaws of a grizzly bear. Bart the Bear starred in Season 3, as Brienne was thrown into his pit for the amusement of the Bolton men at Harrenhal. Bart is actually the second of his name, after the first animal died, while he has a sister named Honey Bump and his owners also keep another bear, Tank. All of the animals are used to film and TV sets, with Bart starring in We Bought A Zoo, Scrubs, Dr. Dolittle 2 and Into The Wild.