Sometimes the screen will show, that if you dump say, 50000 shares at market, you will drop the price and trigger the sale of 150,000 shares. before you do that you have to place orders at and below the prices that trigger the stop loss sales, and bingo, you get your position back, and increase it if you want, at a lower price.

Even better if you do that while having a short position. You can actually easily force it down and make money using 50-100k shares (very thin bids today), while covering on the down pressure...using a buy order you alredy put in...

Once that's done, you can buy even more shares than you bought covering (with the short money you just made), and make money as it pops back up (like today).