Another thing I'd like to point out. Any of you follow Tarregon? It was another company in which its CEO was faced with margin calls. Remember margin calls are basically forced sales, in other words its extra supply forced on the market. I started buying Tarregon at a buck and lower. It rallied shortly after to over 3 bucks a share.
As for saying not all stocks repeat. The majority do repeat, maybe not identically but this surely isn't the first stock to be down nearly 20% in a day or a stock that has been cut in half in a short period of time.