The X’s above show the points where the banks have been placing buy trades.
When the price shoots up creating the demand zone, the banks still have a few more buy trades left which they need to get placed. In order to get the price to drop back into the zone the banks must take a little bit of profit off the buy trades they have been placing, when the banks take profits the current buy orders are consumed and the price begins to drop.
When the price falls into the region where they have placed their first buy trades they use the new sell orders which have come into the market from the traders on the lower time-frames placing sell trades because of the drop, to get the rest of their buy trades entered into the market.
This whole event happens within three hours of the demand zones creation, if the price continued to rise after the demand zone formed then its unlikely the banks would have made the market return to the zone because all of their trades would have been placed.
The rule which I give in my supply and demand trading article is if the market has not managed to return to any zone found on the 1 hour chart or below within 24 hours of its creation it means the banks are probably not going to use the supply or demand zone to get more trades placed.