I mean it’s quite simple. You’re a hedge fund that is short on a stock like MULN. You start by placing incremental buy orders while the market is open. This pumps the price up which draws retail investors in. They dramatically pump the price up. Once the stock is up 500%, you place block trades to cover your short position. These orders don’t route to the exchange which in turn wont drive the price up anymore. Once your short position is covered and the stock is still up 500%, you short the fuck out of it in the post market session when the stock can’t be halted. Now you’re short with a huge gain but you still have to weed out the bagholders. You occasionally pump the stock to give bagholders selling opportunities. Eventually the bag holders are gone and the stock that you shorted at $1 is trading at $.05