RE:Maybe share price is "about" where it should be? I have to disagree here. No one expecting a straight line. But we are looking to approximately correlate the sp with fundamentals.
By what metric is BBD where it should be? Compared to peers market cap? Based on sales? Forward earnings? Analyst estimates? All point to a higher price and make the last month's decline difficult to understand if shorting is discarded (which we know isn't the case).
Shorting goes with volatility. Bombardier could easily take steps to stabilize the sp.