Duncan didn't hold back even a single percent of his strength when he slashed at the sword light.
He knew that the sword light emanating from the short sword was dangerous. Sword attacks are inherently more offensive than other kinds of attacks. They had a sharpness to them that was hard to replicate even by saber attacks. Combined with the presence of the sword light, this attack was really dangerous to the current him to defend against.
Hence, Duncan didn't even think of defending. He attacked back with Absolute Severance slash multiple times, hoping to negate quality with quantity. He didn't know if the attack by the small sword was as powerful as the sword cultivator boasted. However, the sword aura emanating from the small sword gave him a bad feeling. So, he didn't slack off with his response.
And just like he expected, the sword aura from the small sword was indeed domineering.
