Any new news will be hit it hard by shorters to kill any interest. Watch the volume not the share price. Thus stimulating the story the company is selling or an off shore reg S or other convenient scenario. Watch for large blocks that show up but have a MM special code, cross overs, etc. Without warning the buying pressure is too much and the short begins to cover.
Short covering combined with new investors buying into the stock causes the stock to go up.
Often the whole thing starts again. Just a vicious cycle sometimes. The shorts, unlike the dumper though, has an unlimited loss factor should the stock price go up. Remember this is just my personal opinion. Check with a licensed financial professional on all matters of the stock market.