That was a MMer (probably CDEL) re-clocking their short so they don't get in shit with FINRA. The signs are obvious: first trade of the day, the whole trade in one single trade, a volume that no long would sell at these prices. It was a cross from one Mmer to another. That gives these D-bags until after the 10q to settle and if they don't want to settle they just do it backwards and start the clock again. Common game they play when they can't cover and don't want to chase the stock.