This is just one of the P99 things they broke and keep breaking. Essentially, imagine a bubble around the mob. It's a sphere so this includes mobs above and below. If there's a social mob in that sphere the mob won't run. If you drag the mob just a fraction out of that sphere at low hp it'll start fleeing.
How I think it should be implemented is if there is two or more socials agroed on a player they shouldn't run. Proximity to social stuff should have nothing to do with it.
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