wolf now changes into a slightly different form when he has triggered his adrenaline rush, also the knife he gave to fox/julia, he got it when the forger visited earth in diguise to see if a human was worthy of weilding it and wolf 'saved' him so as a gift, the asgardian gave him the knife due to wolf's kindness, as a sign of affection, wolf, in turn, gave it to fox. only wolf and fox can weild the knife. the only thing wolf has done is add a wolf's head to the hilt
