Just a question to clarify - that 2nd last H4 bar on the AU to me isn't a bullish engulfing bar because it doesn't engulf the previous down-close bar - so when you say bullish engulfing do you mean that it is an up-close bar with a close near the high and a larger range than the previous bar (that's how I would describe that 2nd last bar). Obviously an important point is that is at that trendline.
