ICC10 & 25 Griefing
As all of you probably know by now there is a new raidwide buff that everyone get when entering ICC10 & 25.
Hellscream's Warsong / Strength of Wrynn- Increased HP, Healing and Damage by 5%
If you (after you've killed marrowgar) talk to Garrosh/Wrynn you can deactivate the buff and make everyone in raid lose the debuff. Soft reset wont work for it to "respawn" that only works pre-marrowgar.