Talk:Shape-shifter/@comment-70.192.64.3-20140718094536/@comment-162.194.48.167-20140924222842

Billy was never even a wolf. The change is caused by proximety to vampires and during the time billy would have been able to change there was nothing in or around the la push area to trigger the gene. By the time the vampires returned, Billy was too old for the gene to be triggered. Only when a wolf stops phasing does the aging begin again.