By all accounts Yang should be going up, but as you witnessed it went in the opposite way dramatically. Most likely the PBoC has gone in and started either providing liquidity to companies or outright bought shares on the open market, propping it up. I mean just look at markets today in the U.S., Powell said there will continue to be rate hikes, but not as high as it was believed to be. And the market went from red to positive in under 10 minutes. It's just that the market is extremely volatile and anything that confirms their bias, the market celebrates.