Thats like questioning Links moves on OoT, how do they know how Link fights? Hes not a real person! Neither is Sheik. They create moves for the character so they can adapt to the game. Theres really no other explanation. Nintendo can do with their characters what they want.

__________________

[Myspace] [My Static-X fan site] [My Deviantart] ~*~Farore is Exquisite~*~
I <3 my Aeffles! My child is Link_38, so be nice!
My friends know who they are! Mess with them and face SHEIKAH WRATH!!
...No one will ever detect this...