Classic Stuck in Throne of Thunder Raid

Does anyone know how to get to the halls of flesh shaping in the throne of thunder on raid finder? I tried the feather but it won't let me go into any of the halls. I'm stuck at the roost of Ji Kun. None of the videos I watched of the raid actually show how they entered the halls. via /r/wow https://ift.tt/3KDEz3f