Originally Posted by galzohar
Assuming a healer is doing something low like 1000 HPS, with salv that would be 300 TPS. Say it's shared on 4 mobs that's 75 TPS. Over 60 seconds it's just 4500 threat which is not impossible to overcome, but consider longer duration, more threat when one of the adds is dead, and most likely higher HPS and no salv on the healers and it becomes that much harder to pull it off before a couple of healers are dead. Not to mention your TPS won't exactly be 1000+ without a boss hitting you for rage. I'd like to see a more detailed explanation of how you get aggro when the MT died on kael and karathress (assuming they're taunt immune, of course).
Linear scaling stats and their relative increase
A couple of pages ago someone showed diminishing returns on armor. However, this can be said about *ANY* stat that scales linearly. Call the stat X and benefit=a*X+b where b and a are constants, the relative incerase of adding dx would be dx/(ax+b) which obviously goes down as x increases. So saying armor has diminishing returns is kinda misleading, as every stat in the game that scales linearly (and most stats in the game scale (at least approximately) linearly). That kind of diminishing return can be said about increasing stamina for survivability, block value for threat or attack power for DPS. They all have diminishing returns on their relative increase by increasing the stat by dx, since they all scale linearly (or approximately linearly).
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This is a little bit disconcerting. I would say fairly confidently: no on both accounts. First of all, your derivative would lead to a scalar, second of all it is done in a vacuum and does not make practical sense.
Block value is a scalar increase - yet it provides exponential returns per point. This is straightforward:
If a boss hits you for 1000 and you block for 600, you take 40% damage. Increase 200 block:
If a boss hits you for 1000 and you block for 800, you take 20% damage, a 100% improvement from before, for only 33% more block value. Increase 200 block:
If a boss hits you for 1000 and you block for 1000, you take 0% damage, an infinite increase, for 25% more block value.
Mitigation and avoidance has exponential returns per point for their relative damage reduction. If you go from 99% to 100% mitigation or avoidance, you become invincible.
The problem is mitigation takes exponential amounts of armor to increase per point. This is unlike any other stat that I am aware of, unless you are defining "slow" abilities by absolute reduction - a change sometime around the Naxx era.
The math done on the original post, and in the one you described show the precise relationship between the change in relative damage reduction as a function of armor, instead of mitigation which is non linear.
Armor vs mitigation defeats mitigation vs relative increase by a square factor.
Avoidance returns are exponential, period. There are no diminishing returns.
This is also shown on the original graph.
Also FLK mobs do not share aggro. They just don't.
Why would the mobs go to the TANK if they shared aggro? The DPS do more aggro overall to the sub bosses than any individual tank, even if each individual tank themselves does the most on a particular mob.
The thing is is that it is trivial to overcome healing aggro on a boss even after the tank dies - it always has been that way!
We've had the FLK tank die when the THIRD add went down, about 4 minutes into the fight.
The boss then went straight for the offtank healer healing the third sub-boss (this tank was primarily healed by 1 player, whereas the MT was healed by 4-5 players so the mob went to the healer who had the highest load during that entire time).
It killed this healer, then another, and by then I had landed 2-3 shield slams, and a few other moves, and he stuck to me for the rest of the fight.
I'd say that is pretty strong evidence that aggro is not shared, because it went to a healer first, not a single dps, not a single tank, except the tank who was attacking him, and only after killing the top aggro healers.
Classic aggro situation.