Tried again. Not only is Guldan able to repeatedly hit you with Terrified, he heals. The miniscule damage I did at the beginning of the fight was gone. I spent my time trying to heal and run away. When I came near, I was spammed repeatedly with Terrified. Very disappointed that Blizz would do this. Yes, I am very upset, and dropping the quest line. I hope I am able to play BFA on my Horde Shaman. I did BFA with a Horde Shaman a few years ago, and did not have this problem. I wonder if Blizz tweaked it in their updates?