Think of them as...written instructions and training manuals. Ways to impart the information if a person isn't around to explain it themselves.

[There's a stillness that overcomes the vampire as Trevor explains what's going on. Talking. Shit. That's not good, that could be trouble. He turns on his heel, moving to the door at once.]

If she's talking, she's been found, and that could be trouble in and of itself. C'mon.