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There is an old saying, "To attack a city is inferior, to attack the heart is superior."
Merely in terms of swordsmanship, Lin Yun actually had enough skills to contend with Liu Ji, and even ways to defeat him. However, Lin Yun felt it best not to use the Holy Spirit Sword Intent he had learned from Tai Bai at this moment.
It was a trump card kept in reserve; if it were revealed merely for the sake of a sparring match, wouldn't that be a waste?
But other Sword Intents, if used, would only put Liu Ji at a disadvantage; defeating him, however, was rather unrealistic.
After all, Lin Yun was only aiming to stall for time; victory or defeat was not within his considerations. Keeping more of his energy and achieving his greatest purpose, that has always been Lin Yun's mode of operation.
Zhang Biyu, although her main attention was placed on the mountain and Wu Xin, also spared some thoughts to watch the contest between Liu Ji and Lin Yun.