Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-203.219.243.223-20130807015312

Based on the preview for next week's episode it seems like Derek might give up his Alpha powers in some kind of werewolf ritual to heal/save Cora. It looks like Peter will be instructing him through the process. This reminds me of the theory I have long held that Peter intended to heal/resurrect Laura (after completing his revenge killing spree) in Season 1. Considering how strongly he feels about his family and the fact that he had a resurrection plan ready to go for Season 2, it just makes sense that he was only 'borrowing' Laura's Alpha power and fully intended to bring her back. If only those pesky Argents hadn't found her body and chopped it in half, scattering the remains to make sure she stayed dead.

Thus Peter knows about the Alpha power ritual to save/resurrect werewolves. 