Since the pumper has closed the buy order at over 10k sats, it makes sense to assume that that person assumes the price will go above that, otherwise he would make a huge loss. That is why I bought the dip. I never bought this one before, so it is a medium risk / high reward chance imo.
It took at most 10 BTC to drive the price to 10k+ sats, the market turnover reached 3000+ BTC that day.
The order book was empty, so the pump had virtually no cost for the pumper. I'm sorry for everyone who bought into.