It might be that the two giant rats were too at ease, that they were entirely unperturbed about the structural integrity of the tunnels dug by other underground rats. They did not split up, and instead ran past twists and turns in their tunnel. As a result, Fang Ning and the System had to follow the two rats through mountains and rivers before the two red circles in the map finally stopped.
Vigilante A halted his steps, and Fang Ning studied his surroundings using the System View. They were now below a cliff.
"There's an abandoned valley right in front that is surrounded by cliffs. There's no way out, and they could only enter the place underground. This could prevent people from laying siege in the area, and it's also very difficult for others to locate this place from above." The System explained.