Having just swindled thirty-three tons of gold, Yang Yi was now about to rob the very same amount of gold. Although it was the same gold, and the crates probably hadn't even been changed, for Yang Yi, this was a completely different mission.
Earning money twice from the same item, stealing back what he had sold—whether he was doing the stealing or doing it on behalf of someone else—it looked like a double-cross no matter how you sliced it. Yang Yi thought it through carefully and then felt that this was indeed a double-cross.
It was just a somewhat different double-cross, that's all.
Whether it was a double-cross or simply carrying out a task given by the cleaners, if Trident was to take action, they had to be given a good reason to proceed.