Your lust for a kill is so intense that your connection with The Entity is momentarily lost, making you totally unpredictable.
Upon gaining the Bloodlust Status Effect, Beast of Prey activates:

• Grants the Undetectable Status Effect for as long as Bloodlust is active.

Beast of Prey grants 30/40/50 % bonus Bloodpoints for actions in the Hunter Category.
The bonus Bloodpoints are only awarded during the Trial.
"Where did she go?"