Power attack + Shield of reckoning

[K1]

Power attack.
Raisi shield.
End turn.

Can i use another Flourish move?

If so, does it reset again at the start of my turn?

[Rek Rollington]

Flourish is limited to once a turn, not once a round. So if you use it on an enemies turn it won’t effect you. But if the action is somehow triggered on your turn (readied action maybe?) then you wouldn’t be able to use it if you already power attacked or wouldn’t be able to power attack if you already used this reaction. Seems extremely rare that would come up.