Friendly Fire and Dark Empathy

[Razakai]

Currently, Dark Empathy is pretty vital for minionmancers, as otherwise your casters will murder you very quickly. Of course, this means your mages in the back line will still carry on blowing up your hapless skeleton warriors, so I thought about extending the friendly fire protection to all minions. Where is the function that calls on Dark Empathy located in the codebase? I took a look around but couldn't find it.
Also, as it's so vital, I'm thinking about just making friendly fire be off by default and giving DE some extra bonuses. Is there some sort of line you can put in for a summon to disable all friendly fire? A 'friendly_fire = 0,' function would be pretty fantastic.