Chen He was literally crushing the enemy before him. Whatever the other side tried, everything was somehow countered by him.
The enemy tried to use concentrated bombardment in different areas in an attempt to finish him off by blocking all escape routes, but nothing was helpful. Like a cunning fox, Chen He used his Agility and sharp reflexes to find the optimal spot to move to in the shortest possible time, used the unfamiliar terrain to his advantage, and even forced the enemy to stop the bombardment when too many allied units were in danger of being engulfed by the bombardment.
One shot was all they needed to win. Both Chen He and the enemy knew that one shot would mean the end of everything.