We were doing Heroic Anduin, and we were in the last intermission, we got the boss to 10% so it phased to p3, BUT it took away the damage reduction buff BUT the Remorless Winter dot was still on, so we got hit by a 50k+ dot so everyone died, since apparently I cant put a link in here, there is public logs, guild is Efficient from Stormrage, pull number 24 on March 10th.
Same thing happened to us on Normal Wednesday night. They probably broke it when they made it so Anduin auto-transitions at 10% health. I added the log in my thread:
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