Eating meat and meeting a mouse (1)

The skinny cultivator lowered his head and looked at the tip of the blade that had appeared in front of his chest. When he was introducing the divine Thunder bead, a blade tip suddenly appeared in front of his head. The blood-stained blade tip looked so sharp. Most importantly, all his strength had disappeared along with the blade tip. He couldn't even use the simplest power of the divine Thunder bead.

The skinny cultivator didn't understand why Zhao Hai didn't give him the chance to finish his sentence. Isn't this what the books say? Before fighting to the death, one must say a few words to show one's Valiance. Why did it not work here?