Feng the Accursed 10 Man Normal Mogu'shan Vaults Guide - FATBOSS (http://www.youtube.com/watch?v=O4JVwz91gns#ws)
Heres the Macro for this guy
/tar NameOfOppositeTank
/click ExtraActionButton1
/targetlasttarget
Use this macro as soon as you see boss casting [spell]116157[/spell]
I modified that macro to use whomever is on my focus, which I would set as the other tank since you cannot use the spell on yourself.
/click [@focus] ExtraActionButton1
I used the previous macro on Khader and it worked quite well, this macro is untested at this time.