I am a fury and I always thought the nox flames hit just a little harder than most other AoEs at the same level. It took some practice to get to the point of solo healing the mage group through this mob. The fury needs to get a solid rotation down because the flames has a stifle component. I never liked to rely on the steadfast rune for this fight but it does help.
T-shell on pull and then make sure to cancel it as soon as flames hits. Second AoE; pop Serenity and Porcupine and again cancel both as soon as flames hit. Third one can be T-shelled. For fourth porcupine might be back up depending on reuse and use Natural Clense (if you are able to watch if your steadfast rune proc'd you might not have to waste this cure). 5th one can be shelled, 6th Serenity should be back up, 7th shell and so on. Don't forget about the signets as well.
Depending on how the fury specs they may either have another stifle breaker, Howling with the Pack or a group ward, Protective Instinct. I personally go with Howling incase the fight goes long however a group ward may help survivability during the rounds without AoE blocker.
Also remind your other healers to cross cure and cross ward. Assuming you have at least two warders they should be able to throw a single target ward on 2-4 people and still keep the tanks alive. And perhaps ask your enchanters to Sever Hate people in this group. The troub should using Turnstrike every time, the fury has a little better chance at not being one shotted so sever hate the mages in the group.
Also look at your mages HP and Critical Mitigation. If they have anything below 35k hp take a look at what AA spec they are using and anything below 230 Critical Mit make sure they have all the CM adorns they can get.
Get them farther away from the mob. They dont need to be hugging his but since they are ranged dps. Just dont get to far away, they need to be able to dps the statics when they are up.
Thats the problem, the mage group is getting wasted by the Nox flames almost every time if the fury doesn't have tortoise shell up. Am I missing something on how the heck to keep them alive? We can burn the hell out of all the adds, but those AE's come around and its over.
That will be enough dps if you can keep your peeps alive.
You should be good with that amount of dps. could be wrong but I think you need about 1.5mil sustained not to get overwhelemed by adds but still kill him good time.