Not true about the undead part btw... ghouls are considered undead and they flee.
Now, as I remember it, if one of the two is feared, the mob will flee. The rule is: More than one currently in melee combat with you. Also, it does depend on the con for most mobs. Most mobs will run no matter how many there are if they're green to you. One of the exceptions to that rule that I remember from farming is rockhoppers. I'm don't think it matters if the mobs are different factions, but I can't say for sure on that one.
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