Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-124.149.176.139-20130724141530/@comment-4802762-20130725191259

It wasn't stupidity, it was shock. You'd be surprised what would happen if you were in the same position (and don't say you'd retract your claws because no one ever really knows what they'd do if put in that situation).

Derek's claws pierced Boyd heart long enough for him to die. Remember, they can't heal if the object stays in for too long. Peter impaled him then threw him across the field. His nails weren't in his chest long enough to kill him.