Vitali would prepare differently for Haye. And Vitali only looks slow and stiff after he has earned the right to do so by punching his opponent into a clammed up shell. What's the point of jumping about and wasting energy when our opponent is standing there stationary covering up because he knows he cannot land anything on you? It's called intelligent boxing, when Vitali is under fire he comes alive, if he can conserve energy against an opponent who isn't firing much back then why not?