Shorting the stock at the right time can overload the buyers to push the price down. If it is done at the end of the day, it can be used to try to restrain the price and volume trends that would attract investors who monitor the trends.
Possibly, it can give the slow accumulators more days to buy at lower prices if the stock price has a down day. If the investors buy more shares during the day than they short at the end of the day, they can be ahead of the game.
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