Board Thread:False Info and Speculative Discussion/@comment-26011812-20150130115942/@comment-11533671-20150225185749

^ I'm not sure. I don't believe Derek was aware of the abilities of his mother and sister insofar as how instantaneous their wounds would heal. Since Peter was charged with teaching him then I doubt he was aware or privy to the ways his mother taught his sister, which could also be a reason why Laura could fully shift into a wolf, Talia's methods were probably way different than Peter's.

As for the self confidence...yeah I'm sure he had a lot of it. It just seemed as though he just "knew" exactly what to do to stop the threat....beyond just battling it conventionally. He didn't hesitate one bit, just went straight in, grabbed its head and split it open. I think he didn't worry about their attack since he's dodged them even before the "evolution" phase. He didn't worry about being attacked while crushing its skull simply because he knew it would end up dead while he took a small chance that he would be hurt.

Maybe I'm wrong about all of it but that's how I read it as I watched. Either way, I look forward to S5 and hope Derek is in it more than briefly.