Look at that same chart, zoomed out.
To get as many bids as asks at 108, you have go right down to 80!
If my math is right, a long position taken at $105 at 2.5:1 leverage and 90% reserve would get liquidated at $75. Since there's only 3100 btc to $75, someone could sell 3100 btc down to $75, then likely catch the subsequent liquidations to regain their bitcoin holdings at a lower price. Hmm. Perhaps that's what the eager bitstamp seller was trying to do when they dropped the price to $90? Or perhaps there was an eager seller to $95, and the rest was the liquidation of a bitfinex user that took a long position at $120+? Big liquidations like that used to happen all the time when Bitcoinica allowed 10:1 leverage.