As mentioned in the graphic, if there is a strong rejection of the Trend line, it will form a new Lower High prompting confirmation of the new Downtrend in the 4H chart
Comment:
BTW, as you can see, both things happened, the TREND did change to an uptrend on the Daily, and there was s quick setup for a countertrend Sell at the rejection of the TL for the intraday 4H SELL until 1550, then price continued the uptrend after a short consolidation around the 1550 -1559 zone.
I am expecting further upwards movement to the 1595 zone.