As far as I know, THAC0 isn't affected by dual classing. In other words, not only is the swashbuckler bonus not simply discarded when it reactivates, it doesn't dissapear when you first dual class. And if it does dissapear, it wouldn't be stored as a Swashbuckler bonus. You level up, it adjusts your THAC0 accordingly and this is permanant: there is no effect saying "-2 THAC0", you simply have a THAC0 2 lower than you would expect.
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