Deception.

Allure had directly challenged the dignity of the Red Dragon when she called out if he was worthy of fighting her. Dragons were innately arrogant creature. Perhaps, only heavens knew why this particular species, no matter if they were at the bottom level, for example an even a earth dragon, a beast lord level spirit beast would be very arrogant too. 

Imagine the level of the Red Dragon. As soon as Allure questioned, the Red Dragon made his move without hesitation. His speed was quick and as he clawed at Allure. The surrounding Legendary Beasts did not say anything because they did not have the guts to go against the dragon clan. 

However, Allure suddenly vanished from her spot and an eerie chuckle echoed in the void. The people gathered here were all supreme legendary beasts, but the laughter sent chills down their spines. 

They all tried to look for Allure but they found no trace of her. Red Dragon sneered, "Petty tricks."