Most stuff in this game you would have to use the word 'magic' to explain. Even little things that most people don't think of, like how can you be fighting a mob while another mob is standing just a meter away unaware that his friend is being killed? Only way to explain it is that we have some kind of magic invisibility buff that prevents mobs from seeing or hearing us unless they are very close. So long story short, yes its magic. Pretty much everything is magic.