- For instance, Shield wall is UP. 1000 damage is now 600 damage (40% reduction)
- Now, PS is UP (both CD up). SW was applied first so from 1000 you still go down to 600, and another 40% reduction is applied to this 600 damage, so 360 damage
- SW fades : back to 600 damage received
- PS fades : back to 1000.
Dunno if its how it works though, but it makes sense. I would be very interested in proofs about this though =)
Its dmg x 0.5(shieldwall) x 0.4(painsuppresion) = dmg x 0.2 and so forth with other temporary buffs like inspiration etc.
But: I dont know how a warriors stance (-10%) or even damage reduction from armor is being considered. If i recall right, in wotlk the damage was first reduced by armor and then eventual blocks. This damage was then reduced by buffs as stated above. I dont know if they kept it that way in cata. Everything chanced...
It doesn't matter what you take first. The result will always be the same. If you pop 2 different cooldowns that reduces damage by 35% and 50% as an example, you get hit for 65% x 50% damage = 32.5%
The order of multiplier doesn't change anything AxB = BxA, so you would get the increased mitigation, but the effect will overall be lower because you will only reduce the damage of the allready mitigated incoming amount.