RE: to mr laser I understand what you are saying. Shake out of weak hands and all that. Maybe you are right, maybe not. I'm not going to argue. I don't have enough information to form a judgement. I would need to see the complete daily log of trades, including the brokers behind each trade. Even that might be not enough to say for sure.
I still think the big drop could be caused by a buy/sell imbalance in a thinly traded stock. In other words, a random event, not a conspiracy.