Sorry if this is cluttering the board ... but some seemed interested...
Selling NERV Puts / Lowering Risk / Covering Short Sale
Typically I sell Puts and let them expire to maximize profit ...
but don't feel like just because you sold 20 $5 NERV puts that you are LOCKED IN until expiration 5 weeks from now.
You always have the option of covering your short sale anytime before expiration.
As the value of the Put goes up or down, you could either cover for a gain or cover at a loss depending on how the Put as changed.
Typically as the stock price goes UP ... the Put value that you shorted goes down.
and the closer you get to strike date ... the put price goes down
Both of the above allow you to cover and still make a profit (typically). Albeit a much smaller profit than waiting for expiration.
If the stock price should fall, that's when the Put may increase in value ... and since you are short, will cost you $$$ to cover before expiration.
Why cover your short sale?
You might do this to free up that margin $$ and go after a stock that caught your eye and you "just have to have it" (CYDY??)

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You might do this to limit losses in the event the stock hit strike and you feel it will continue to fall. Take your lumps early.
As another poster said, this isn't a "set it and forget it" play. You want to keep an eye on the stock price and make sure there's no trouble looming.
But pretty easy exit is available if need be.