Someone was defending the 400 area and market shorted 3 mill, it went against him and he was liquidated. At the same time many others also were forced to market into the same area. Someone caught it, realized what happened and dumped the price. Now they should be getting out in this area, and we can go up again.
A cluster of buys in one area is never a good sign if nothing else is coming to support it. I suspect shorts that were stopped out filled this guy. Price should return back to the 400 area. Any dump is only for more liquidity to fill longs.