When the big money attacks a stock they go down significantly. It is as though there the other brokers agree to stay away and not go long for a period of time so they short attack gets covered. You rub my back and I will rub your back. As you can see SYNA continues to make new lows for the day. Eventually someone has a number of shares that seems to be a prearranged sell and the short will cover a bunch within a small price range.