Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-108.81.117.0-20130922203715/@comment-209.197.171.31-20130926235742

An easy way to explain how he knew about Peter going on a rampage is when he had Isaac in his custody. He probably plunged his claw into the young beta's neck to look into his memory of every time he was with the fallen alpha. For example, in season 2, Scott did a brief overview of who and and what Peter did plus how he died. Also, Peter certainly did hang out from time to time with Derek and Isaac in their search for Erica and Boyd.