I meant a state that the repo does not like and not really corrupted. say you push your changes and someone else pushes their changes and you both try to move the head and you get a dropbox conflict. You would have to go and fuss with the refs and the refs log to find out where the other head should have gone and manually change things that you shouldn't have to. Not the end of the world but for a guide that is seemingly for beginners why hassle with it when there is a free way that is easier to do what they are trying to accomplish?