Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-13965604-20140218204226/@comment-95.149.92.195-20140218223001

I think the point was that the posion weakened the Nogi, meaning that Stiles can be in control of his own body for a while. I'm guessing that as time goes on the poison will dissapear from his bloodstream and the Nogi will become strong again.