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I find it really interesting that the language for the reroll basically says, "once per scenario, after you roll the dice, you can reroll 1d20 die" but doesn't mention "before you learn the results."
EDIT:
Pathfinder Society Roleplaying Guild Guide, Page 37, Rerolls wrote:
Recognize that this reroll must happen before the
original result is determined and the player must use the
reroll result, even if the result is lower.
The Guide explains the "before a result is determined". This might be good to keep in mind for those players who don't read the Guide.