I don't know if it's a unique situation, but one that one of my player has asked.
Say for example, the PC is a Bounty-Hunter Survivalist, and he has bought the "Heroic Fortitude" talent (25xp).
Later in the PC's life, he takes on the Hired Gun Marauder specialisation. Is the "Heroic Fortitude" a "free" talent? Meaning that he can spend 5XP for "Feral Strenght", then another 10XP for "Knockdown"? OR does the PC has to re-pay the 10XP for the talent?
I know that in this specific example, there is another route to get the talents, but for the sake of the example, what would you do with this situation? Potentially, there are other situations similar (though I haven't found them yet).