BTC surged to $90,000 early in the morning, and the entire network cheered: bottom confirmed. But a few hours later, it dropped back to $86,000. No negative news, no announcements, no black swan events. If you think this is a shakeout, then you have already fallen into the most dangerous illusion of the year-end. The real reason is not in the order book, not in the candlestick charts, but in four words. The first reversal: 90K → 86K, within just a few hours, giving back all the gains.