NSAV Holding Inc (NSAV)

[shotsky]

No, 'they' didn't walk it down. Stupid traders did that.
If you sell at market, the price will instantly start dropping, because you are saying 'I'll take whatever', so the mm's snap them up at below market.
If you sell at close of market, that is still 'at market' and the same thing happens, only it happens at the close.
The simple solution for both is to sell at a limit that is near what you will accept for your shares. That keeps the share price from spiking down.
You should NEVER sell at market unless you are exiting the stock and don't give a crap what it does to other shareholders.