What would be the mechanism of the given reaction?
Bottom line: $\ce{HSO4-}$ is a really bad nucleophile, and it doesn't enter in the picture. 



(I realize after scanning that I'm missing the "+ H+" alongside the final product.)



Question for extra credit: after the second step, why is the third step (carbocation migration) favorable rather than directly reforming the double bond on the right-hand side ring?