Gameplay and story segregation takes place when the established lore of a franchise is not properly represented ingame by mechanics. In this case, when we beat Kael in Tempest Keep his body says "Dead" because that's what bodies do when their health reaches 0. Later on by MoP they'd added the coding for beaten bodies to show as Unconscious as they did with Garrosh. It was immediately revealed to players after they returned a drop from Kael to A'dal in Shattrath that he had not been killed. The existence of the hearthstone is another common one. As Varian Wrynn, King of Stormwind, believed them to be a myth until Anduin showed him one Jaina gave him. You know, that thing that appears in our bags by magic when we come into being and that every innkeeper will give us an infinite amount of for free?