dcollins said:
Not so. All AOOs must come before the action which provoked them.
If I start fifteen feet away from someone, and move 30 feet past them, they get an AoO when I leave a threatened square.
The action was "Move", but the AoO does not occur
before the action; it occurs at some point during the action.
Someone can crawl five feet as a Move action. They provoke an AoO from anyone who threatens them "at any point during their crawl".
Since you can only crawl five feet, there are
only two points during your crawl - the square you start in, and the square you end in. "Any point in your crawl" includes those two squares. If I crawl
into someone's threatened area, I provoke an AoO.
If I have the Hold the Line feat, I get an AoO when someone charges into a square I threaten. If you consider the provoking action to be "Charge", then I can't take the AoO before they Charge - they're too far away. Even if you consider the provoking "action" to be "charge into a square I threaten", I
still can't take the AoO
before they enter the square I threaten... because until they enter it, I don't threaten them! This AoO must, of necessity, occur after they enter the square... even if they stop in that square.
If I have the Karmic Strike feat, I receive an AoO when someone successfully hits me with a melee attack... and the AoO explicitly occurs
at the same instant as the attack, not before. And besides, before the attack roll is evaluated, it's unknown as to whether or not the attack is successful.
Bull Rush, Overrun, and Charge don't provoke an AoO; only leaving a threatened square in the course of one of those actons does. But the Run action provokes an AoO in and of itself. If I enter a square while Running, I am performing the Run action in that square, and I provoke an AoO.
-Hyp.