Here is an odd situation that doesn't happen very often, but it's worth a mention. It came up around the start of Friday. Price was recently trending down on H4 and H1 toward and through previous weekly low. I was hunting shorts. Decent enough engulfing bar presented itself. Then it didn't trigger on the next candle. It was an inside bar. Then another inside bar. The trade triggered on the third candle after the signal engulf.
On the surface this would be breaking the rules. However, inside bars directly following signal engulfs are not counted as failed trigger candles. This is because inside bars indicate price is only either resting or unsure of direction. In either case, your potential position has not been disproven, at least not at the point of the inside bars. Price has not retraced against the signal engulf. It is only pausing at this point. Therefore, if price continues in the same direction as the signal engulf, after the inside bar, you want to be on that train. So get on.
On the surface this would be breaking the rules. However, inside bars directly following signal engulfs are not counted as failed trigger candles. This is because inside bars indicate price is only either resting or unsure of direction. In either case, your potential position has not been disproven, at least not at the point of the inside bars. Price has not retraced against the signal engulf. It is only pausing at this point. Therefore, if price continues in the same direction as the signal engulf, after the inside bar, you want to be on that train. So get on.