It looks to me like a move that was designed to try to start a bit of panick selling. Not likely a retail investor. More likely a move designed to create the impression that news had been leaked and it was negative. If there actually had been news leaked, we would not have recovered as we did and we would have had MUCH higher volume. Trading houses and pro traders can see stop losses and they probably took some out. These folks have sophisticated trading software. I also noticed that the level 2 info did not match up with the actual trading. Lots and lots of small blocks were trading but level 2 was not showing that. There wasn't that many idividual buy orders that matched up with the volume at the time of the "plunge". Very suspicious.