Animals will react in different ways. Someone else may have gone into that enclosure and nothing would have happened. When you are dealing with things in the wild or something that is wild you must always be aware of the posture and not try to intimidate the animal. You will loose. People would ask me all the time if my Keeshond bites.
Wolves are no different then any other wild animal.
They do have a fear of man and avoid him with a passion. However, we must look and the reintroduction program in Yellowstone and wonder if the wolves are becoming less fearful of man. I see this in that the packs would allow themselves to be seen by motorists along the roads. It makes you wonder. We still have much to learn and I have the most.