Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-70.62.56.205-20130725042949/@comment-10759846-20130726061602

It may also have something to with female and male too.

As Talia could full shift and Laura looked close too it I think she couldn't fully shift because the power was handed down due to Talia dying in the fire.

Peter shifted into what he did because hes a male which makes him look scarier, thus maybe the reason they don't want Derek to shift because it will make him look to scary and a bad person.