Just the actual physical ability to hold four instruments simultaneously and do some of the things that Vivien was able to do is mind blowing to any surgeon. He never went to medical school and he became one of the great teachers of medicine himself, people are just amazed.
The beast exists because it is stronger than the thing that you call evolution. In it is some force of life, a demon, driving it through millions of centuries. It does not surrender so easily to weaklings like you and me.