1) They didn't get ridiculous like stamp and dax 0.83% so they could fill the channel to 20K. Not sure how much sense that makes.
2) They could take their time and make a nice, extended 4th leg and hit 21.5K.
3) They could make btc -3.33% only folks' Christmas while killing the dreams of altcoiners, but as an added bonus, would likely induce Bitfinexed into future bitcoin-based Christmas PTSD which we shall hence forth refer to as... "bitchristmas'd".
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Well, looks like option 3 may win, but my timeline was terrible this is done now.