I was in the middle of an 11 with him tanking at 70. Right in the middle he stopped tanking completely and I died as a healer. Anyone else have this issue?
Also, in the middle of the last 8 I was doing with him I stopped being able to target him for heals completely. I relogged and it didn’t help. I had to completely leave the delve and restart to be able to target him.
I don’t run delves so I personally wouldn’t know but you would be better off moving this to General Discussion or the Bug Report forum where people may be reporting similar problems or are at least far more likely to respond.
Did his health drop too low? Maybe you should be dps and have him tank. Either way you will want to post in the bug report forum.
I have run a bunch of delvs and yesterday for the last boss in one I had to switch him to tank. He got too low in hp and stopped tanking, at that the boss came for me but was still able to kill him. Maybe that is why that happened to you.
Having some similar issues. I was in the middle of The Spiral Weave and Brann basically stopped tanking the Nightfall npcs, who proceeded to unalive me with extreme prejudice on my Evoker.
Edit: I can safely say it had nothing to do with his HP, as he was at 100%. I would cast a spell to pull the mobs, and it would seem to be 50/50 if Brann would even engage, but when he did he did not seem to be able to hold aggro on the Nightfall Inquisitor and two Hopestealers.