RE:Golden selling opportunityJust because you sold short it does not mean current investors in Air Canada should sell anything, and certainly not short.
You need to accept the fact that if the market should opt to move the Shareprice in one direction or another then it's simply going to move it. Your job, if you should choose to accept it, is to try and not make a trade you will later regret.
Partial trades using a Dollar Cost Averaging Strategy is something I would suggest researching. It may not be sexy and exciting but (over time) it tends to out-perform day-trading with a whole lot less hassel.
Best Regards.