Shimmermist Runner mount bug - can't aquire

[Illiviel]

WoW Freakz link: https://www.wow-freakz.com/item_finder.php?item=180727&name=shimmermist-runner https://www.wow-freakz.com/npc_finder.php?npc=171767&name=shizgher
Character name: Illidatr
Bug description: Shizgher don't attack after i did labirynth right way. That makes Shimmermist Runner mount impossible to aquire. Shizgher was supposed to attack me after i did labirynth(i checked guides i am 100% sure i did it right), but he don't attack at all. To get Shimmermist Runner mount i need to kill him. He appears as ally all the time. I did labirnth everytime after respawn with one life.
Proof: https://imgur.com/znDKUsr