Check out the video in Members Area > Premium Resources: https://www.bearbulltraders.com/advanced-lesson-bearish-engulfing-crack-strategy/
Saw the setup twice today. Once on $BABA (semi-successful back to VWAP but just too choppy), and $MU (failed).
I believe one factor that gives the move such downward momentum is that stops are being taken out on the 5-min chart (close of prior white candle), and 1-minute chart (loss of the 9 EMA).
I was actually on the opposite end of a Bearish Engulfing Crack once. Went long $BSX on an Opening Range Breakup and was stopped out during the flush.