If you want to protect yourself and place a stop order say at $9 so that your minimum loss is a buck, once the price hits your order it will turn into a market order and will sell at what ever price (could be over or under the 9 bucks). If you use a stop limit, it will only fill at $9 or above. So if it started falling really fast and your order at $9 didn't fill, it could go down a few more bucks and it wouldn't sell because you used a limit order. Read this: http://investorshub.advfn.com/boards/read_msg.aspx?message_id=80522592&txt2find=limit
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