In part 3, I covered the use of the melee focus. This time, I'll go over ideal positioning of this group and it's weaknesses.
The bombers are the sword and shield of the group. They apply pressure damage to the enemy group. This pressure damage also serves to discourage melee from closing in on the group.
Everyone needs to stay within the PBAoE that the bombers are generating if possible. This allows the melee focus to easily hit and kill anyone foolish enough to try to close in melee with the help of the AoE damage. This also prevents Witch Elves from using stealth on someone. You also gain the benefit of damage spread. Damage spread is caused by the difficulty of picking out one target from a mass of players. Typically, you will prevent a focus fire on a key target with damage spread. This only negatively affects the melee focus in this group. Players by nature will hit the target nearest to them until they notice another target. This will buy you at least 2 seconds just from a typical person's reaction time plus whatever time you get from the difficulty of targeting.
Proper use of CC is the group's major weakness. The group will need to pay attention to any incoming staggers from a Chosen and either hit Resolute Defenses or spread out in a calculated manner to avoid it. If a Chosen hits both healers with a stagger, you're screwed. A zealot spec'd for the single target stagger or a Sorc or Magus with the morale 3 stagger on a healer in the back will also end up being bad for this group.
For this reason, healers should not be standing on top of each other. They should be on opposing flanks if at all possible. Ideally, they want to stagger the healers and silence/disarm/knockdown a DPS.
The PK bomb group is easy to defeat, but played properly, you will give your enemy precious little time to execute. Hesitate and you will be lost. Play fast, push hard, and be smart.
Next time, I'll talk about Tarelther's 3T group. It's unusual, but effective.