Dear JasherEnoch,
If you want to play the game "Bitcoin Difficulty Derivative (BDD)" discussed here, you MUST read and understand all explained in the first message in this thread:
https://bitcointalk.org/index.php?topic=430137.0If you don't understand all that without other explanations, it's better for you to stop immediately playng, sell all and find another game

Alex is correct here, the minimum needed to understand this Derivative is reading the OP/Contract. The fact that you referenced mining, which is not done here at all, tells me that you either breezed through it or did not read it at all.
In order for SELL to be issued a dividend, the Difficulty must increase faster than daily dividends are being paid out to B.MINE, at least 6.5% per period (more, as evidenced by this Period, if there was no SELL dividend the prior Period).