nvm. I figured it out! For those that want to test it out this is what you do
Step 1) pick a price that you think it will continue down from. If you think price of one bitshare will go down from the current price of 22.00bitusd then place short at 22bitusd per btsx
Step 2) Place a buy order where you think it will stop going down. If you think it wont go down past 19bitusd then place buy at 19bitusd
Step 3a) If you were right and you bought at 19bitusd then you cover you short position that started at 22bitusd and profit!!!
Step 3b) If you were wrong and you want out then you need to buy at the higher price and cover your bitusd
Finding this out only cost me 1,000btsx. Hopefully this saves somebody from losing more!!!