Since he already knew that he was unable to follow Sonia with his current strength and speed, he didn't forget to transform on the way, and increase his strength.
At this moment he had taken this situation seriously and wouldn't allow to suffer something like what he suffered earlier once again.
He couldn't allow himself to lose face in front of his Master once again. No matter how beautiful and how charming Sonia was, he didn't care in the least.
He wanted her dead!
On the other hand Sonia was having the same thoughts about this damned Vampire, he deserved to die for having thoughts of harming Tianlong Yun, still she didn't move from her spot.
She looked just like some kind of stony statue at that moment, without any sign of life. Just looking coldly but attentively at the upcoming attack.
With her current abilities she had complete confidence upon herself to not only dodge the upcoming attack, but also leave a deep wound on her enemy.