Maybe a large short position was taken out around $950 in anticipation of sales that then got unexpectedly bought up by a raging bull market? Now a very large Chinese miner and fabricator is actually under water to the extent that they are very desperate for a much lower price for its business survival? Such a desperate actor will do anything, including threatening to fork bitcoin or otherwise nuclear options, since it is going bankrupt anyway. Maybe it is as simple as someone who overly centralised power, and therefore risk, around themselves miscalculated with derivatives bets and now wants a bailout, again?
That is exactly what I'm saying from the very beginning of this blocksize "dispute". It is time for Bitmain either be a regular pool or go bankrupt and clear the way for new pools.
haa 
