Zeng Han had undergone over a century of tempering, encountering numerous fellow cultivators, and was no longer someone bound by rigid rules.
He was well aware that his Yin Light Flying Needle might not be faster than Zhang Yan's sword ball, and if he didn't strike first and take the initiative, it would be hard to gain the upper hand.
Thus, when he released that needle, it was exceptionally concealed, moving swiftly and sharply. Only a barely perceptible silver thread skimmed across the water's surface, tracing an arc and heading directly toward Zhang Yan's flank.
This "Xuanji Yin Mang Needle" was refined using needles from a Divine Pine from the Taihao Sect. Once it pierced a cultivator's body, it left no visible wound but could in mere moments sever the target's meridians, cutting off their spiritual mechanism.
