The psychology behind a bearish engulfing is a shift from greed to fear, where buyers get trapped at the highs and sellers seize control. The gap up at the open, followed by aggressive selling that closes below the previous candle's open, indicates that buyers lost control. What began as bullish optimism ended in bearish domination. The first candle shows buyers in control, the second session opens with continued optimism creating a potential bull trap, then sellers overwhelm the market, erasing all gains and triggering protective stop-losses that accelerate the decline.
The failed breakout often invites short sellers, compounding the reversal.