There was also the fact that throughout the entire time fighting the dragon, the blood dragon never ever used blood manipulation.
It was understandable that the power of the blood dragon had been beaten down to his level of strength.
However, that should not have affected its abilities.
After all, Chiron had also fought other cored beasts in this world and all of them still had their abilities.
It came as a total surprise when he discovered that the blood dragon did not use blood manipulation.
It would have been so much easier to have killed him if the dragon had just hunted other animals and used their blood to destroy the entire mountain in search of him.
But this did not happen.
Also, the old man had told Chiron to show his valour by killing the dragon just like his ancestor Chikit.
However, Chiron was already aware of the actual story and he knew that the only reason why ancestor Chikit killed the dragon, was because the dragon allowed it.