Upon witnessing Ling Chen's devilish transformation as well as his showcase of power, though the Saint Beast Bai Wudi was extremely shocked, he quickly regained his bearing and clarity.
He remained cool and collected. After all, he was an experienced fighter who wouldn't cower in fear against a powerful foe.
Moreover, he has faced more powerful foes in the past and still ending up victorious. As such, a mere mayfly like that human kid could only dream of frightening him.
"I see, haha, you are extraordinary indeed." The Eagle Saint didn't know how to express his rage outside of laughing. He already showed great restraint by not pouncing toward Ling Chen and bit his head off.
Unlike the Saint Beast Bai Wudi, the Eagle Saint was kinda hot-headed and impatient. If Bai Wudi wasn't there, he would have transformed into his beast form and killed Ling Chen already.