When All the Hedge Funds Scream Sell, that means they already loaded up Short.
My guess is many loaded up short on Thursday & Friday of Options expiration week in March. They are starting to feel the pain now and are screaming for people to sell. Their strategy worked yesterday until late in the day when a rebound occurred. This morning looks identical to yesterday and it looks more and more like buy the down gap open and sell the rebound late in the day type trade again.
One thing I have learned in the market is that the more you scream for people to do what you want them to do, the more they don't listen to you.