Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-69.125.32.234-20140121041834/@comment-5322646-20140121133513

Yeah based off how nervous he looked when Derek came back I would think that It's something along the lines of:

1. Peter had the opportunity to help his sister out of the fire, but chose to leave her there assuming he would be the next Alpha.

2. How Peter tricked Derek into giving up his spark so Peter would be able to take it.