CRACK! Arad fell to the ground, his body cooling down after Vlad left. The vampire king's power was indisposed blood control. If you have it, he owns it. He's a being over mortals with shackles on their very life.
Arad's vampire side shut down before the kind, losing its free will. But the draconic side was an arrogant, unbending monster of pride.
Just as a human's body drops its blood pressure when suffering a wound, Arad's body reacts. But on the other side.
The muscle walls of his veins tightened, forcing the blood to remain trapped in his circulatory system, resulting in his blood pressure rising.
Arad's heart started beating faster and faster, activating his fight or flight response and beating the blood into submission, forcing it to course through the veins.
But that shouldn't have been enough to withstand the king's dominion. Something else in Arad's blood stirred. The Lycanthropic blood stood fast, resisting his will.
How would you fight Vlad? He has an absolute control over blood.