I'm the retail investor see short selling ban should be extend to 1 week if its drop till certain level.Y?Because it's reduce uncertainty of the stocks,reduce the banks risk on the stock(in case of foreclosure of company stock if it drop till certain level,reduce the costs of market makers of pushing up the price till certain level,increase the chances of listed company to borrow from investor and bank(if it's do not drop to x value) and other.

Good advice. I also agree that short selling should be postponed after the shares drop, to ensure you are certain of what you are doing. It also reduces the bank's risk on stock, since the company can go broke. In fact, I can advise those who engage in stock exchange to take a trading break during such times