In fact there was no such method as the blood ritual to use the blood from high level Ki warriors. It was his special physique that actually helped him.
...
He had a unique ability that he inherited from the bloodline of his family.
However, his situation was little problematic. Up until he was in the level three of ki warrior , he did not get access to this ability of his.
He did not even have the idea of the ability he might have. It was a surprise to him when he had suddenly awakened an unique ability during a fight.
He could use his blood and ki to boost his power by a large margin. That was the sole purpose of his ability that he had awakened, but there was a catch.
No one, not even a superhuman like ki warrior would be able to survive the loss of blood on that scale.
