For a zen archer making a flurry of blows, would this apply only to a single attack roll, and remain usable only for a single re-roll per round? RAW that seems to be the case.
Benefit:
You must declare that you are using this feat before you make your attack roll (thus a failed attack roll ruins the attempt). You must use one of the following weapons to make the attack: kama, nunchaku, quarterstaff, sai, and siangham. You can roll your attack roll twice and take the higher result. If one of these rolls is a critical threat, the other roll is used as your confirmation roll (your choice if they are both critical threats). You may attempt a perfect attack once per day for every four levels you have attained (but see Special), and no more than once per round.
Its not for a re-roll. For any attack roll using one of those weapons (zen includes his bows) you can choose to make a perfect strike and roll twice instead of once. You can do this once per round.
Its not for a re-roll. For any attack roll using one of those weapons (zen includes his bows) you can choose to make a perfect strike and roll twice instead of once. You can do this once per round.
Sorry - what I was thinking and what I typed were quite different. But based on your response, it is indeed only one attack from a flurry that can benefit from this effect?