Without having faced an opponent that was able to control the space in a radius spanning thousands of kilometers as if it belonged to them, the Black Dragon quickly noticed that the bipedal being it faced was far stronger than initially presumed.
Unlike the Queen who had been keeping tabs on it and observing it throughout the century, it had simply been oblivious to her plans.
The difference in their knowledge about each other was vast, and easily perceptible owing to the fighting style they demonstrated.
While the Black Dragon was stubbornly fighting as it had for millennia, the Queen had created a style of fighting that was tailor-made to counter the True Dragon's attacks and approaches.
Jason clearly noticed this after numerous clashes, in which Queen Lilya was simply testing out the waters.
She wasn't even using all that much mana, let alone lesser divine energy in order to overpower the Berserk Black Dragon.