Profit-taking.
A debate erupted in the chat about profit-taking by large players.
So, I will say the following, there may have been some profit-taking on Bitcoin, but not on the scale that you think.
Firstly: There is not enough liquidity in the market to absorb such a quantity of Bitcoins, there simply won't be enough stablecoins for profit-taking. I won't even mention the price drop.