Board Thread:Legitimate Canon Questions/@comment-82.233.108.70-20140322071534/@comment-150.113.8.138-20140325143810

If you watched the season finale Isaac (iirc) said that silver would kill them if it was left inside like from an arrow. The reason Allison's dad didn't kill the one he shot during his first encounter was that the bullet went completely through only breaking the mask and not killing that Oni.