Vlad did not let Orion finish her sentence before his blade fell, separating her head from the rest of her body. His hack carried so much power that he even severed the tree behind the woman. There was no hesitation in his move as he never considered for even a second allowing the angel to live or take her as a prisoner.
Orion had a sea of knowledge in her mind, which might have helped him understand the plots and strategy of the angels in Terra, but he could not allow her near his forces and could not keep constant vigilance on her.
Angels, especially those of noble descent, were expert manipulators and could easily turn the hearts of those around them, even their captors. There was no way Vlad would have allowed such a poisonous snake to invade his domain.
