Luckily I have not had to deal with anything like that as of yet. Hogs can have a very strong feeding response, and at times use very little caution when that feeding response is active. Once again this weekend, I had a hognose jump out of its bin and onto the floor during feeding and come after my feet. This isn't something all hognose will do, but the strong feeders can be a handful to work with.
Personally, I don't believe that hog should have been given the chance to get that far along eating its tail. Someone should have intervened.