Game Mechanics: Flee mode broken in undead Lower Guk / Trakanons Teeth?

[Rasah]

Speaking of flee, mobs in LOIO don't seem to have the social aggro. What I mean is, if I quad drolvargs in DL, and I get 4 of them down to 1%, they keep chasing me until they are separated enough that they stop and "flee".

However, if I AE goblins in LOIO, or quad barracudas in LOIO, they will all break off in different directions once they are below 20%. Since they give faction hits, shouldn't they mob together until there is only 1 left and it flees?