My guess is that you win big-time since rollbacks generally result is significant drop in value. As for the details, if you had borrowed 100k old shares in a 5 to 1 rollback they you would need to repay with 20k new shares. But most likely the 20k new shares would have a value between 50% to 90% of the original 100k old shares, depending on how the market perceived the motives for the rollback.
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