Wubei traced the strong signal and discovered its transmission path was incredibly long. It used an unknown number of Boundary Points as relays, and at times, it even looped back on itself.
Not only that, but some locations seemed to have extra measures in place. He had to be extremely careful with every Boundary Point he passed, or he might trigger a warning signal left behind in advance.
If the other party discovered they were being tracked, they could simply sever the connection at one of the Boundary Points in the chain, and he would lose the trail completely.
But the longer the search took, the higher the chance of being discovered.
