
Fedorarogue |

I have for awhile now been playing in my game the rule that attacks of opportunity stop movement of of the creature that got hit or stops the grapple or whatever was attempted. Though I just added a new played to my game that had never heard that before despite being a 3.5 player before as well.
So what I want to know is do attacks of opportunity stop movement or other actions that provoked them or not? In 3.5 I could swear they did though I am not sure.

cwslyclgh |

In 3.5 it depends on the action... movement is not stopped, but certain actions such as grapples and disarm attempts are foiled if the AoO deals damage to the attacker. This information can be found in the listings for the individual special combat actions.
In pathfinder a successful attack of opportunity against combat maneuvers doesn't foil the attack entirely, but it does cause a penalty equal to the amount of damage dealt.

Drejk |

In pathfinder a successful attack of opportunity against combat maneuvers doesn't foil the attack entirely, but it does cause a penalty equal to the amount of damage dealt.
Here is rule cwslyclgh mention. I couldn't find it until I checked under
Performing a Combat Maneuver: When performing a combat maneuver, you must use an action appropriate to the maneuver you are attempting to perform. While many combat maneuvers can be performed as part of an attack action, full-attack action, or attack of opportunity (in place of a melee attack), others require a specific action. Unless otherwise noted, performing a combat maneuver provokes an attack of opportunity from the target of the maneuver. If you are hit by the target, you take the damage normally and apply that amount as a penalty to the attack roll to perform the maneuver.
There is also feat Stand Still that can be used to stop others with attacks of opportunity.

Drejk |

Okay so the part about other combat maneuvers is right kind of lol. Though I guess I have just been wrong about movement. It does make more sense that they wouldn't stop moving if hit with an Aoo.
Movement can be stopped with Trips Of Opportunity - either Improved Trip to start a trip without provoking AoO to make it clearer or with guisarme to trip opponents within 10 feet while being outside of their threatened reach range oneself).