A small clarification: 1h MACD is still positive, just the divergence went negative.
MACD is a lagging indicator, the divergence is less lagging. This term confusion happens a lot in these forums.
Possible way to explain it to someone with physics/math background:
TA math physics
Astrologyprice function coordinates
Birth ChartMACD first derivative speed
Star Chartdivergence second derivative acceleration
Planetary Motion