Yes the shorting is very interesting. I am not to sure how it works but they were shorting big back in the beginning of Dec and the price was rising.
Why are they still holding on ? they will be bankrupt if the price keeps going up. Maybe they aren't so smart, this was the worse possible time to short and they are still holding on.
Even if production doesn't meet expectations it will do in the next quarter so it shouldn't have too much of an affect on MC.