Ok here is an example:
A. 15 min candle closed above preceding 15 min - activate
B. Now look... 1 minute candle, closed below the low of the previous 15 min candle... therefore we don't enter a trade in this candle 15 min time frame, as we have shattered the low of the previous 15 mins, it could return.
C. Sorry C should be third arrow - Next 15 min candle creates new high and closes above preceding 15 min candle - activate
D. 1 minute candle breaks above preceding 1 min low - enter.