Techniques that shared the same lineage didn't need to be exchanged; one could obtain them through cultivation alone. Su Xin had known this for a long time.
When he had exchanged for the Blood River Divine Sword, the system had said that once he cultivated it to mastery, he could comprehend the Blood River Divine Finger on his own.
Now, after using Three Fingers Flicking Heaven, his mastery of the Twenty-Four Solar Terms God-Startling Finger had greatly increased. It was essentially the same principle as with the Blood River Divine Sword.
Three Fingers Flicking Heaven was originally the ultimate secret art comprehended after cultivating the Twenty-Four Solar Terms God-Startling Finger to mastery. Su Xin had only used a consumable, but because he already had a foundation in the Twenty-Four Solar Terms God-Startling Finger, he had still gained considerable insight.
It was like having a master proficient in the technique demonstrate it for you on the spot—and even more vivid than that. After all, even though it was a consumable, Su Xin had performed it with his own body. The technique itself was gone once he had used it, but the sensation it left behind wouldn't disappear.
This could also be considered a shortcut provided by the system. Some techniques could be comprehended on one's own without exchanging for them, just like Three Fingers Flicking Heaven.
Su Xin's mastery of the Twenty-Four Solar Terms God-Startling Finger was already close to 100%. If he cultivated for a while longer, or used Three Fingers Flicking Heaven once more, he might be able to comprehend the ultimate secret art of the God-Startling Finger.
During the few hours Su Xin spent recovering his strength, word spread about how he had broken into Nian Gang's Autumn Altar, taken Dong Buyi's three blows head-on, and reclaimed Jiangnan