Tripping strike attack and attacs of Opportunity

[Khelvan]

One other thing i need to clear up.

A fighter with tripping strike gets an AoO and hits critically.
The target falls.
Tripping strike says that tripping a target triggers an AoO against the Target.
Since the fighter has had an AoO against that target would he get a second one, assuming he had combat reflexe ?
In the rules is stated one has only one AoO against a specific target. Would that apply here to and the AoO from tripping strike is wasted?

Thanks.

Best regards

Khel.

[RedDogMT]

Reread Tripping Strike. On a critical hit, you don't get an AOO; you essentially get a 'free trip' that is successful "if your confirmation roll exceeds your opponent's CMD".

[Archaeik]

Tripping Strike wrote:

Benefit: Whenever you score a critical hit with a melee attack, you can trip your opponent, in addition to the normal damage dealt by the attack. If your confirmation roll exceeds your opponent's CMD, you may knock your opponent prone as if from the trip combat maneuver. This does not provoke an attack of opportunity. If you are tripped during your own trip attempt, you can drop your weapon to avoid being tripped.

This is a relatively convoluted feat mechanically.

You never actually roll a combat maneuver check, but you get to behave as if you did, including the risk of being tripped in return.

You misread and misinterpreted the line about AoOs.
It is saying that you do not provoke an AoO for trying to trip your opponent. (Ostensibly because Improved Trip only applies to CMB checks, which this is not. You also would not add the +2 bonus to your confirmation roll to determine success, as I read it.)