The one who gripped you tight*

I've been paying more attention to the visual aspects of Supernatural recently, discovering neat little parallels. The following parallel, however, surprised me so much it smacked me upside the head. ( Exclamation points! )

So we all noticed that Grandpa Samuel's angel-banishing sigil wasn't quite the one we're used to, ( and now we know why )

* Castiel, 4x01, Supernatural