When the market is under pressure like it's been lately there are traders who get margin calls around 11:00 - 11:30 am and many time they need to sell to raise cash.
So in todays case they were selling into the traders who bought the open for a bounce. So they got lucky today.
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Replying to @MasterBJones and @traderbjones
How did you know exactly when the margin calls would happen? So I can be aware myself in the future. Thanks for all your help!