Guru? This makes absolute sense; traders and shorters look at technicals and not the company and what is coming down the pipe within an organization. Shorters see the fact that a stock has more then doubled over a 3 week period and they pile in. Then when the volume dries up they take advantage of the decrease in trading to manipulate the stock down.

Going the other direction, once the stock has gone below the 200, 50, 20, 10 day moving averages and starts to approach what they believe to be the low; then they cash out of the short position.

Traders get into trouble when they hold short positions and major news events change the course of the company involved. I look forward to their demise..