Of course, this included Chen Jie's planning. If a ship was captured by Elder Liu before even setting out, that would simply be a business issue. Lord Yelu, upon investigating, would discover that Nan Batian was just trying to make money, plain and simple.
But what if several ships had already set out? At that moment, if you were to seize those ships, who could be certain what the eight ships that escaped were carrying?
Of course, Lord Yelu was very unlikely to believe that Nan Batian had truly gone mad and would so blatantly help the Zoroastrian Sect transport weapons. But since the ships had already set out, who knew what was on board? What if Nan Batian had anticipated Lord Yelu's assumption and believed that Yelu wouldn't trust that he was transporting weapons for the Zoroastrian Sect?
Heh heh...
This was a trap of suspicion, one without end once begun.