This sudden large slope pull-up is generally done by the national team (because it requires a lot of money to pull up with this slope, and ordinary institutions and bookmakers do not have the ability), and most of them are ordered to come out to support the market. The situation these days is to ensure that the market does not fall excessively and let the Agricultural Bank of China go public smoothly.
It is estimated that the national team will quit after the listing of Agricultural Bank of China, so be careful.