Blue flag showed us the decline of The A/D line, before entering sideways.
Sept 30th, showed the lowest price and the lowest OBV line.
When price crossed up VWMA (black flag), there was a significant rise of OBV line, while The A/D line was still in sideways mode.
Jan 19th, when the price and VWMA are still in the sideways, the A/D line slightly rose up meaning there was an adding volume action. Even though The up-days fewer than the down-days (OBV line declined).
March 16th, price crossed up VWMA, the OBV line moved up, and The A/D line has been rising up since Jan 19th.