The enslaved Grandmaster had purposely questioned the kaijin's motives to create a brief opening.
In this opening, the Grandmaster proceeded to use his most powerful technique, a major Ethereal-Class Aether Art known as [Miracle Fist].
Against normal opponents, this attack was able to penetrate any defense and land a "miraculous" blow that could defeat someone even several rings higher than themselves.
To attach concrete examples to this estimation, an [Aether Grandmaster] at the first ring would be able to penetrate the defenses of a peak [Aether Grandmaster] or even an [Aether Lord] at the first ring.
When the Grandmaster struck out against the orangutan-like kaijin's head, he was hoping to burst it open like a rotten watermelon.
"Hah!"
A brilliant flash of light occurred the moment that his fist made contact with the kaijin's head, a hopeful sign that his surprise attack had succeeded.
Unfortunately, it didn't.
[Ha! Nice shot, shithead.]
"What the fuck?!"