Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-108.218.169.89-20140128052843/@comment-24458290-20140129160909

This isn't word for word, but, this what I remember Scott's dad saying to him. "I don't know why you guys are lying, or why Stilinski is content to listen to this crap, but, try to remember if half this story about barrow is true, then not only did someone help set him loose but they are a pawn in his game"

So when I heard this, I assumed Scott and Stiles told him their theory, without telling him about the supernatural element. I could be completely wrong, but, that's why I figured they told him.