It is quite possible for a powerful force to make a hole or cut off a limb and yet the blood is not gushing. Immediately. Because the blood vessels have been crushed together, maybe the person has low BP from shock, there is a temporary plug as it were, but this will quickly come undone from moving more. This was quite a hole, there were other pictures around and it's real. Later the guy posted a picture in the hospital, whining about it and how his arm was going to be weak now.