The immature bald eagle was feeding on the bison carcass at LeHardy Rapids in Yellowstone. When he saw the grizzly bear approaching he knew he was going to have to leave his place at the dinner table. As the bear approached, the eagle left the carcass.
In this picture, if you look closely, you can see the eagle flying towards the grizzly bear. In the next picture you can see the eagle flying directly in front of the grizzly bear. Although it looks like the eagle is only a few inches away from the bear, in reality it is probably about 1 or 2 feet from it.