Lee Shin-Woo had obviously noticed the Beast General's skill activation before Retadane. Being a Breathing Bone Joker with Rule of Bone, he was more sensitive to anything regarding bones and could react more quickly than anyone else.

But this is...

Moreover, Lee Shin-Woo had sensed a new possibility when the Beast General created the Garden of Thorns. The giant bone thorns had certainly originated from the Beast General, yet he felt like he could control them himself.

Rule of Bone was originally a skill that allowed him to control and reinforce his own bones. It made him even stronger than before and allowed him to freely use the equipment summoned through Bone Armory.

There are exactly 17 thorns coming for me. Their sizes vary, but they're all at least 5 meters long. They're connected to the Beast General through darkness mana, and they bind their target and inflict persistent damage at the same time. It's a malicious but effective attack. I can see it all. It’s as if I’m meant to see the way it all works...

His skill had clearly evolved. Instinctively, he knew how the bones created by the Beast General looked, their structure, and even how they would move. Now Lee Shin-Woo understood how he was able to avoid the Beast General’s attacks so easily earlier. It was obvious, wasn't it? He knew and sensed the Beast General's bones...