Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-69.125.32.234-20140121041834/@comment-13965604-20140122181904

184.153.215.92 wrote: i'm surprised no one has thought that maybe Talia told Derek about Peter's plan to become Alpha again by killing Scott and taking his power. That was my first thought.

We don't know how this ritual works, and it's entirely possible she doesn't know anyway. Even if she does know, there tends to be cosmic rules that they can't tell you the future. A nudge at best, so even if she told him watch out for Peter, it's like, well duh.