Vampires' Blood Servants are elites cultivated for over a decade. They not only serve as combat support but also take on the roles of steward and loyal servant. Though always treated as dogs by the vampires, they are not beings who can be discarded at will.
Initially, Lord Leo even went back to Machu Picchu to rescue a Blood Servant, and he almost got trapped there.
As a transmigrator, Charles naturally had issues with his mindset. His morals prevented him from ignoring any life, but his sense of detachment made it difficult for him to identify with strangers and enemies as "one of his own."
To him, Blood Servants might not be as significant as genuine members of the Blood Clan.
When he was learning from Juno, he "accidentally" overlooked this detail.
