| dragonhunterq |
I'm sorry I have to disagree with Kalindlara.
While nearly everything that applies to an initial roll applies to a confirmation roll I don't believe this includes additional rolls of the dice. Attack rolls and confirmation rolls are still separate and distinct things which can and do have different modifiers and effects. for example miss chance due to concealment doesn't apply to confirmation rolls.
If you cast Borrow Fortune in response to the initial attack and threaten a critical, then the bad luck starts from the confirmation roll.