User blog comment:FairyRaven/Fairy Tail Chapter 470: Hybrid Theory, Review and Commentary/@comment-7418318-20160125204101/@comment-24102956-20160126235801

It might have been linked with Draculos' vampiric traits and Vampire Magic would relate with manipulation of the blood within the target's body. Guess that explains why he drinks milk lol.

August would probably want to study that Magic since he's the Magic King who is said to control numerous different types of Magic all by himself.