...And it is possible that now he bought back again and then held for a moment again at the right time to sell again. So I think this op, has another source of income that is why he was loaned
such an amount, in short he is really capable of paying.
This is just a theory, in practice trading looks much more complicated) My friend, who doesn't understand anything about cryptocurrency, looking at the historical chart of bitcoin, clearly sees where to buy and where to sell BTC, but he can't imagine where the price will move tomorrow.