5th day is a long red day that closes inside the gap created by the 1st and 2nd days.
The up trend is accelerated by a gap up. The next few days trend up, however start to run out of steam. The last day of the pattern shows a breakdown and close below the previous 3 days, however the gap created on the 1st day remains unfilled. Since the gap is not filled and the trend is obviously deteriorating, this implies the reversal signal.