Destruction warlocks can solo a pack.
Enter with 4 embers, two conflagrate charges, glyphed havoc and shadowfury.
Target numbers:
http://s2.postimg.org/i0nd08tqx/adds_in_transition.jpg
Spell order:
F&B immolate
Rof
normal conflagrate on 4
normal conflagrate on 5
havoc on 5
shadowfury
chaos bolt on 4 (copyed to 5)
chaos bolt on 4 (copyed to 5) ~ healers stun around now
- 4&5 are now dead
chaos blot on 6
shadowburn on 6
move to the last group shadow burning as you go.
Don't worry about popping bubbles just be as fast as you can, one should be left up from the last group everyone can use it before the first smash.
If you solo tank the tank can solo a group freeing up the rest of the dps to just focus on 3 groups.