Here is my explanation. A lot of people are expecting to sell at earning day, no matter it is up or down, they will sell.

When those sell, and bring the stock below certian level, it will triger stop loss and will keep triggering until stop loss fired up.

The company is a solid one with strong up trend.

I believe next monday, it will close above 9 and will hit 10 in a month. I collected from 9.50 to 8.50, everaged at 9.00.