The character will not move to attack unless they are Engaged by an enemy.
The character will actively seek out nearby enemies for combat regardless of whether or not they are being directly attacked.
but the second one doesn't sound defensive at all, sounds aggressive.
It does doesn't it. Well that's the original description.
The A.I, whatever the setting, is quite bad anyways, i would not rely on it too much. Although i have a bit of a dilemma here, i don't think i would want the A.I to play the game for me, so maybe basic is all we need.