Strengths:

• Burst damage
• 2 AoE Fears + Single Target fear
• Shadow Priest and Warlock augment each other's damage
• Spell lock and Silence

Weaknesses:

• Viper Sting
• Line of Sight

Who to keep pet on:
Warlock (Turn Scorpid poison off)

Possible Warlock Talent Spec's (Standard Spec's):
Unstable Affliction / Shadowburn
Soul Link / Siphon Life

Possible Shadow Priest Talent Spec's (Standard Spec's):
Shadow Burst

If the lock is Affliction kill the Felhunter as fast as possible, keep viper stings on the spriest, kite around a frost trap, silence/scatter the lock after Deathcoil. Drain the Spriest but DPS the affliction lock, they take a lot more damage than the spriest who has 50% damage reduction.

If it's an SL/SL lock don't waste time killing the pet twice, his burst damage is lower but you need to help your Druid not get Feared, he can get bursted very easily in a Fear that puts him out in the open. Once the Shadow Priest is OOM you shouldn't have any problem finishing them off. DPS the Shadow Priest in this situation.

The reason why I say to keep the pet on the Warlock with Scorpid Poison turned off is because obviously the Warlock's casts are the most powerful, especially if they are spec'd for Affliction, the pet on the Warlock can buy you enough time to LOS an Unstable Affliction, a Fear, or a Shadowbolt, and with Scorpid Poison turned off you can still Scatter Shot him.

This combo can drop a Druid from 100 to 0 if he is standing out in the middle, so he CANNOT get Feared, usually the only way Chances EVER gets Feared is if he gets Deathcoiled. Chances will be in LOS of the Warlock long enough for him to get his instant cast Deathcoil off, how do we prevent the Fear? By saving Silencing Shot for it, do not use your first Silencing Shot on ANYTHING but after that Deathcoil, if your Druid gets feared in those 3 seconds he's Deathcoiled your going to die.

You should always be actively doing your best to prevent you or your healer being Feared, I can't say ONLY use your Silencing Shot only on the Warlock Fear's as you should both be doing your best to LOS those, their could be a time where your low, the Warlock is CC'd/LOS and the SPriest is attempting to cast Mind Blast, obviously use the Silence on that. But, for the most part, I use Silencing Shot for clutch moments.