Blood Shadow has emerged, it will surely leave some traces. Su Yang's current task is to find these traces and thus locate the path Heaven Slayer and Buddha Venerable took to leave.
Others who arrived here previously discovered a star and immediately retreated without pursuing further.
Therefore, it's not that Heaven Slayer and Buddha Venerable didn't leave any traces here, but rather that the location of these traces may not be here. They only took a brief look at the star from afar before departing, making it unlikely to find the traces.
Su Yang continued flying in the direction of the star for some time and indeed discovered signs of spatial tears in the sky, indicating a battle took place here.
However, the time since the battle has been too long. So, the remnants of the battle have almost disappeared. Su Yang couldn't find anything particularly noteworthy, but he could distinguish that indeed Heaven Slayer and Buddha Venerable fought someone here.
