@Antonio - yes, that means that there action provokes an AoO. basically means you use up one of your attack of opportunity, so you have to have them available. it does not give you a 'free' attack, just triggers one if you have one available. normally you would not get an attack of opportunity from such an attack vs an ally, but your feat adds another trigger condition for your character. @Hayn - gottta be careful there - AoO's are triggered by various actions, but they do NOT trigger on a target moving into a square you threaten. Common mistake, even from those who know how it works. the accurate wording (put here for those who might get confused by above statement) is that moving OUT of a threatened square triggers an AoE (and to further clarify, before anyone asks, any one action can trigger only one AoE from an individual character, so a target moving through three of your threatened squares only provokes one AoE from you - same target can provoke additional AoO's if they do so with more than one move, or with two separate actions that provoke such.) this is why reach weapons get more AoO's than regular melee weapons, because once you're in a threatened square, you generally must move out of that threatened square to reach the target. its why Ogres are such a bitch. all that reach, all those AoO's to deal with.
