It was just a light flick.
But Qin Guang had infused the marble with Innate True Qi, making its velocity astonishing, comparable to a bullet that had been fired.
At such a close distance, martial artists below the level of grandmaster probably wouldn't be able to react in time and would be struck dead on the spot.
Fortunately, Du Fei was well-prepared for Qin Guang's marbles.
As soon as he noticed Qin Guang's wrist lifting slightly, he tilted his head to the side.
The marble brushed past Du Fei's ear.
Only after it had flown an inch away did the sound of it slicing through the air reach Du Fei's ear.
Shock filled Du Fei's heart.
The marble had flown past before the sound was heard, which meant that Qin Guang's hidden weapon was launched at a speed beyond the speed of sound.
This was even with a smooth object like a marble. Had Qin Guang had a flying knife in his hand, how powerful would it be?
In that moment, Du Fei finally understood.
