The down trend is still the main trend on AUDUSD daily time frame. I washed out by that pin bar trying to avoid full 1R loss with the aggressive rise. But eventually it breaks down and the testing area 0.724 now acting as resistant. And after the bounce up, AUDUSD failed to go higher so we have the chance to start load our short position.
It will be a more comfortable level to place the stop above the pin bar but the closer stronghold can't give an attractive r/r. So, as 0.724 is tested once and suppose it is now a good defence level, stop loss will place around 0.725.