Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-24398707-20140108200752/@comment-24132585-20140108201241

The only reason Scott, Allison, and Stiles suffered consquences (Hallucinations/etc...) was because they died as Surrogate Sacarfices. They died a special way to locate the Nemeton and once they found the Nemeton they automatically came back to life. Peter was murdered and he came back to life by using Lydia. It was not a special way he just sent hallucinations of himself and his younger self (Young Peter Hale) to Lydia to help him achieve his goal.