I think I had a talk with my broker something related to that, maybe this might help, so lets say the price is going down, and you sold it @ .01 to cover, I dont think they will come after you, cause its easy to cover cheap shares, but lets say the price you sell at is .016, and the price per share of the stock continues to rise, then they will come after you and you will need to pay the stocks back. Basically you are meant to cover all the stocks that you have sold at a specific price.....Correct me if im wrong....