Game Mechanics: Low Health Aggro

[mazukon]

This just happened and by my memory defies all aggro-logic in EQ:

Player A pulls a kos, social mob. Another one of the same kind adds on him. Player B pulls off the add. We now have Player A with Mob A, and Player B with Mob B. They each fight seperately (but nearby each other).

Player B gets extremely low on health (~10%) and Mob A completely ignores Player A and charges Player B until death (despite Player B having 0 damage on Mob A).

This shouldn't happen.