For reference first
Black Powder Bravado:
Once per day, when you perform a deed that requires an attack roll and you miss with that roll, you can reroll it. You must take the second result even if it is worse.
Once per day, when you perform a deed that requires an attack roll and you miss with that roll, you can reroll it. You must take the second result even if it is worse.
Parry and Riposte:
At 1st level, when an opponent makes a melee attack against the swashbuckler, she can spend 1 panache point and expend a use of an attack of opportunity to attempt to parry that attack. The swashbuckler makes an attack roll as if she were making an attack of opportunity; for each size category the attacking creature is larger than the swashbuckler, the swashbuckler takes a –2 penalty on this roll. If her result is greater than the attacking creature's result, the creature's attack automatically misses......
At 1st level, when an opponent makes a melee attack against the swashbuckler, she can spend 1 panache point and expend a use of an attack of opportunity to attempt to parry that attack. The swashbuckler makes an attack roll as if she were making an attack of opportunity; for each size category the attacking creature is larger than the swashbuckler, the swashbuckler takes a –2 penalty on this roll. If her result is greater than the attacking creature's result, the creature's attack automatically misses......
Upon performing a successful parry and if she has at least 1 panache point, the swashbuckler can as an immediate action make an attack against the creature whose attack she parried, provided that creature is within her reach. This deed's cost cannot be reduced by any ability or effect that reduces the number of panache points a deed costs.
1.So can I use the trait to reroll a parry?
2. Can I use the trait to reroll a riposte?
Grit, luck, and panache represent three different means by which heroes can gain access to the same heroic pool, using it to accomplish fantastic feats. For characters with a mix of grit, luck, and panache, they pool the resources together into a combined pool. (Those who use panache and luck gain twice their Charisma bonus in their pool.) For feats, magic items, and other effects, a panache user can spend and gain luck points in place of grit or panache points, and vice versa.
ACG, Pg.56
The part that worried me was that parry was an opposed attack roll. Therefore I was not sure if the whole "miss that roll" would allow it to qualify.