BTC 7-day +14.4% is a case of vertical surge; RSI 72 is overbought, and the price deviates from the MA20 by 9%, indicating strong downward mean-reversion pressure in the short term. On 09-21, a single-day gain of +6.7% along with double the trading volume is a typical sign of a sentiment peak; this structure can trigger a pulsed retracement of 5%–8% at any time.