Ridiculous I know.
The lore is hardly ever accurate in wow, guess one lone horde or alliance sharpshooter could of just sniped the Lich King with an AP round through his helm when he came out to fight at the Wrath Gate. Would of saved everyone a lot of trouble and Sarufang a son..
There a huge holes in the lore, wouldn't worry about it - i don't, it lost any sense of believable fantasy narrative a long time ago. When some things apply for one but not the other, when you pull out huge discrepancies in the powers within the game, but are not accurately reflected I lose interest.