Huh, I was sub rogue and I did stay behind the boss during Ancient Evil but Aysa just kept rolling into my way in the middle of a Smash cast. The boss before the fire spirit definitely takes long to kill. As for the winds thing, I never noticed that. Usually you can just stay behind Aysa and when it goes out take your own charge and stop in the middle then wait again and go again to Dafeng. I am surprised you didn’t find the healing quest not difficult though, but I would agree it is annoying. I just either get overwhelmed by the adds (even with healing spheres from that nearby Huojin Panda) or the healers get killed by them easy while I am trying to survive.