In patch 5.3 a small change was made, buried in the official notes. One of the bosses in the Cataclysm dungeon Zul'Gurub, Bloodlord Mandokir, was hotfixed so that he would no longer cast his insta-kill ability, Decapitate, on his current target. That means he can now be soloed by all classes in level 90 gear, making the Armored Razzashi Raptor mount much easier to obtain, given that you are will to battle the 1% drop rate. Good luck and happy hunting!