There were indecision candles forming at fibo 0.5 level, which indicated that trend may get reversed from this level. However, instead of going up, there was a comparative larger bearish candle, 18:19 right after those indecision candles. The bearish candle closed below all the indecision candles, which showed that price had made a decision of going down. So I entered at the beginning of 18:20.