In the game I am currently playing, the fighter and my character (a paladin) have the Paired Opportunists teamwork feat. We wanted try them out and see if the benefits were worth taking a teamwork feat. We both took the feat when we reached 3rd level. I figured I would be next to him most of the time (since out of all our characters, he and I are the only melee combat oriented characters and I am the only person in the party capable of healing with the parties newly bought wand of Cure Light Wounds in one hand, and a short sword in the other) so taking a teamwork feat in which we were adjacent to each other just seemed to make the most sense.
The fighter also has Improved Trip and uses a khopesh.
So he will run up to an enemy, and in most cases, trip it. I will follow behind and stand beside him and attack the enemy. Since the enemy is prone, he has a negative -4 to AC versus melee attacks. This makes it pretty likely I will hit him.
Then when the enemy tries to stand up, we are able to make an attack of opportunity that receives a +4.
I believe the way it works (from reading other threads) is the person provoking the attack of opportunity is still considered to be prone, so we effectively receive a +8 to hit. If we happen to roll a critical threat, we receive an effective +8 to confirm it.
Since we are 3rd level, we are able to do this to a lot of things.
I basically want to know if we are doing this right and welcome everyone's opinions on the matter.