Nostalrius Begins - Quality wow vanilla realm (1.12)

First of, i am not sure if this is the right section to post these kind of bugs but i couldn't find better one.
Second, i am not sure if this has been reported before, so i am doing it with a video now.
After we killed rend, some mobs just bugged out for no reason. They have attacked half of the raid while other half remained out of combat. This was frapsed after group has fallen apart.

https://www.youtube.com/watch?v=j2IdD-z6ayw

yeah that bug has been reported already. it is mostly caused from the rend event bugging out or something happening that does not engage the scripts of the mobs past rends room's gate. once rend is defeated, it should enable those mobs.