Ravenna started the suspicion through the supposed message 'Bob' left behind.
She was wounded right after visiting Master Tobias.
More importantly, Clara deduced that the perpetrator is undoubtedly a Vampire Hybrid.
Lucivar already suspected from the start that Master Tobias had something to do—or even was a part of the Supreme House of Valerius. If that was true, then he undoubtedly possessed the Vampire bloodline, and that would strengthen the suspicion against him.
But even then, all of those clues weren't anything concrete.
It could simply be another Vampire Hybrid entirely, and Master Tobias was innocent.
From a moral view, Lucivar shouldn't be making preparations when it was still uncertain like this.
Sabrina was curious about his reasoning, and frankly, knew that he was hiding something.
He was moving too comfortably for someone who only realized his savior might not be a good person.
Before departing, she knew that Lucivar told Leandra and Ravenna to lay low.
