Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-4753851-20140218063758/@comment-24539797-20140220045545

It also matters if the werewolf is conscious or not. Peter was in a coma and could heal himself only very very slowly. When Derek caught Deaton to find out if he's the Alpha, he told Scott that a werewolf cannot heal if it is unconscious. Together with the electricity, i guess that makes it hard for Isaac to heal.