Enemies with Bullet Behaviour Overlap

Basically, I have a bunch of NPC's with the bullet behaviour, all chasing other NPC's.

What I want is for them to not overlap when they collide with each other.

I can't use the "Bounce off object" behaviour because enemies aren't usually colliding head-on, but from behind/side of each other because they Follow the other NPC's in a sort of "pack mentality".

Here is the docs.google.com/file/d/0B0X8AGNTMh-dcEdUWDhDSTlKS00/edit

bump?

This has been posted a few times. I came up with a solution which was to 'Stop' pathfinding when enemies collide. This then stops the enemy when they touch another certain enemy, which gives the impression of collision. However I'm not 100% sure on how to do this when all enemies have the same name.