Ji Xinghe, who ordered the throwing of two tactical nuclear grenades, did not stop the destruction of the load-bearing columns. His goal was very clear, regardless of what kind of response Emperor Wu III made.
In fact, he hadn't anticipated that Emperor Wu III would retreat under such circumstances. Although his tactical intentions were obvious and effective, the weapon known as the Transition Knife, one of his trump cards against Emperor Wu III, was actually not on him nor in the Champion Marquis's body.
You could say it's because of insufficient preparation, or you could say it's because weapons like the Transition Knife and nuclear grenades are at their most threatening when they haven't been used yet. Once they're actually used, like the two tactical nuclear grenades thrown at Emperor Wu III at this moment, they fail to have any practical effect and instead weaken one's own strength.
