I did the Shy quest today and this guy made an appearance.  I was actually hoping he wouldnt seeing as how im a lvl 57 hunter and he made it a little more difficult.  Plus i wasnt interested in taming either one of these cats when i hit 60 (just tamed Rak'shiri today)  But they are great cats Sian does huge damage.  And Shy looks similar to Rak'shiri but her eyes dont glow bright green.  But just so you know i dont think it has anything to do with staying close to the rock i believe its just luck as to whether she appears.  Shy feared me and i ran far away from the rock.  We were fighting in the snow.  And i got her life down to about 50% and she called for her mate.  He came out and let me tell you he hits hard.  I frost trapped him and started using rapid fire on shy. He breaks out of frost trap and feared me but i got off one last arcane shot on shy that killed her right as i took off running.  He then went up to her swiped her and despawned.  So maybe the trick is keeping her alive???? I dont know but i do know that he spawed first time i tried the quest and i wasnt near the rock.

Good luck and Happy hunting!!!!