“But still, wouldn’t I be enough by myself?” Masayuki was a member of Lain’s bloodline. As a vampire who could be called one of her children, he was also a high-ranking undead.

...

It took almost no time at all, but he had made the wrong choice. His only chance at winning had been a swift strike, one that could take Yogiri’s life faster than Yogiri could process what was happening. In the end, his decision to fight without an actual plan was the one that sealed his fate.

Yogiri responded to the killing intent reflexively.

“Couldn’t you at least have let him finish transforming?!” Tomochika said, looking at the fallen Masayuki. He was now lying on the ground, in a form somewhere halfway between a person and a beast.

-Volume 1 pages 136 and 232