There are all sorts of stop sell instructions but the prior poster was correct as PSN closed at around $13 and opened next day around $6...it never saw $12.50 and, while I cannot make sense of what you say your broker told you,  I wud think you must have had a stop limit, not just a stop price, above whatever its highest price was the next day and so the broker had no opportunity to sell when it dropped. Did you really want them to sell at the best opening bid price which was about $6??! 

It is really awful situation for all holders above the current price as it is diffficult to see PSN at anywhere near the former levels, even $7 or so, not with the current uncertainty and sentiment, but PSN certainly does not need ""saving""...it has a viable business and sustainable cash flows with relatrively good margins, and capex that can quickly be turned off and on to reflect demand...