Extremes are not uncommon in crypto. This chart has Bollinger Bands at 3, 4 and 5 SDs from the mean (360 day lookback) and the chart has gone past 5 SDs three times in the past three months. Perhaps I should be looking to trade these extreme moves rather than the regular moves (enter at 2SD, exit at the mean). Of course there’s the problem that any coin that makes such a move is no longer available for shorting as the lending pool as gone to zero. Moves like this are nearly always because one coin in the pair has pumped, rather than a catastrophic drop in the other coin. However if I borrow at 2 SDs (which I usually could) but wait to short until it moves a lot further (if it does) then I might start to make some profit.