Deathknight's do it using disease, blood and the power of the unholy. Warlocks do it with dark demons by their side. Mages do it with summoned arcane powers. Druids do it using the forces of nature. Rogues do it through stealth, poison's, shadows and....from behind. Paladins do it by calling to the light for aid. Shamans do it with the help of the elements. Priests do it through the holy light. Hunters do it with the help of animal companions.
But warriors....
Warriors just fucking do it.