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This strategy is known as "besiege Wei to rescue Zhao."
Gu Youyou's objective was not to wear down the White Fog, but to rescue Zhang Chi.
However, rescuing Zhang Chi in the White Fog was something the fog would certainly not agree to.
Therefore, by attacking the fog's vulnerable point, it could be compelled to compromise.
Indeed, as Gu Youyou absorbed it in such a manner, even the White Fog seemed to struggle.
After Gu Youyou proposed her terms, the fog began to dissipate, revealing the figure of Zhang Chi.
In fact, though Zhang Chi had been engulfed by the White Fog and had lost his way, taking a few steps within it, he hadn't gone far.
He was no more than two kilometers away from Gu Youyou.
If Gu Youyou had slashed out with her Stacked Wave Slash in the direction where Zhang Chi was, he probably would have perished on the spot.
